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Question 64610: How much water must be evaporated from 32 ounces of a 4% salt solution to make a 7% salt solution?
Click here to see answer by ptaylor(2198)

Question 64809: a silversmith has two alloys. the first alloy is 18% silver and the second is 54% silver. how many grams of each should be mixed to produce 120 grams of an alloy that is 39% silver?

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Question 64828: I can not figure out this math problem and need help. The question says, "Bill wnats 30 pounds of a coffee blend that he can sell for $7.00 per pound. If he has coffee that sells for $6.00 a pound and another brand that sells for $7.50 per pound, how many pounds of each brand should he use to make his blend?"
Click here to see answer by ptaylor(2198)

Question 64840: What percent of weight Na2s203 is sulfur (S)? (na 23, S 32 O 16)?
Click here to see answer by tutorcecilia(2152)

Question 64839: A druggist needs 25 liters of a solution that is 16% iodine. She has one solution that is 12% iodine and another solution that is 37% iodine. How many liters of each solution should the druggiest use?
Click here to see answer by ptaylor(2198)

Question 65085: The volume of a quantity of ideal gas was help constant. The inital pressure and temperature were 8000 torr and 1500 kelvins. What was the final pressure if the temperature was raised to 3270 Kelvins?

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Question 65087: How much pure antifreeze should be added to 300 gallons of 30 percent antifreeze solution to raise the antifreeze solution to 40 percent?
Click here to see answer by stanbon(75887)

Question 65445: An 80 % idodine solution is to be mixed with a 40% iodine solution. How much of each should be used to get 12,000 milliliters of a 64% iodine solution?
Click here to see answer by stanbon(75887)

Question 65429: The volume of a quantity of an ideal gas was held constant. The inital pressure and temperature were 8000 torr and 1500 kelvins. What was the final pressure if the temperature was raised to 3270 kelvins.
Click here to see answer by 303795(602)

Question 65444: A quantity of an ideal gas had initial pressure of 0.03 * 10^9 atmospheres, initial volume of 0.007 * 10^-2cm^3, and inital temperature of 7000 kelvins. Find the final temperature if the final pressure was 3000 * 10^3 atmospheres and the final volume was 30,000cm^3. solve the equation for t2 as the first step.
Click here to see answer by venugopalramana(3286)

Question 65516: (46) Science and medicine. Celsius temperature readings can be converted to Fahrenheit readings using the formula F=9/5C + 32. What is the Fahrenheit temperature that corresponds to eachof the following Celsius temperatures: -10, 0,15,100?
(48)Business and finance. When x number of units are sold, the price of each unit(in dollars) is given by p= -x/2 +75. Find the unit price when the following quantities are sold:2,7,9,11.
(64) Business and finance. The revenue for a sandwich shop is directly proportional to its advertising budget.When the owner spent $2000 a month on advertising. The revenue was $120,000. If the revenue is now $180,000. how much is the owner spending on advertising?
Click here to see answer by checkley71(8403)

Question 65506: I+(I+2)(3) THere are 9 fewer math books than English books. Write an expression for the total number of books.
(6) A large drink cost 50 cents more than a small drink. Write an expression for the total cost of 3 small drinks and 2 large drinks.
Directions: Write an expression for each of the following.
(9) The sum of an even integer and two times the next even integer
(12) The sum of 1/4 of an integer, 1/5 of the next integer, and 1/2 of the following integer
Directions: solve
(15) The sum of a number and 2/5 of itself is 56. What is the number?
(18) The sum of two consecutive even integers is 106. What are the integers?
(21)Critical thinking: Read exercise 19. Let x be the second of the three consecutive intergers. Then redo Exercise 20 using a similar procedure. so, #19 states the following: The sum of three consecutive integers is 126. What are the integers? and #20 states the following: The sum of three conecutive odd integers is 189 . what are the integers?
(24) Critical thinking: Abraham Lincoln's 1863 Gettysburg address refers to the year 1776 as "four score and seven years ago". Write an equation and solve for a score.
(27) A 48-ft wire is cut into three pieces. The second piece is three times as long as the first piece. THe third piece is four times as long s the second piece. How long is each piece?
(30) After a 20% discount, an item was sold for $9600. What was the original price of the item?
Click here to see answer by checkley71(8403)

Question 65505: Solve:
(27) A watch loses 2 minutes every 15hours. How much time will it lose in 2 hours?
(30) The ratio of international students to U.S.student at a college is 2 to 35. How many international students are there if there are 1575 U.S. students?
(33) A television station found that 145 out of the 350 people surveyed watched a special program on education on Monday night. If this survey is repreentative of the total viewing population (12,250 people), about how many people wtched the television special?
Click here to see answer by checkley71(8403)

Question 65559: Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x +5y = 10
-2x � 10y = -20

Solve each of the following problems. Be sure to show the equations used for the solution.
Number problems. Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

Business and finance. A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 Lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?

Click here to see answer by stanbon(75887)

Question 47273: At which points does the graph of f(x)=x^2+4x-5=0 intersect the x-axis?
Click here to see answer by 303795(602)

Question 41431: Mr. Jones says that he has 3 daughters, the product of whose s is 72. Furthermore, the sum of their ages is equal to his house number. A mathematician claims that even though he knows the house number, not enough information has been given to determine their ages. Thereupon, Mr. Jones adds that his youngest daughter likes raspberry yogurt. Smilingly, the mathematician announces the ages of the girls. What are the ages of the daughters?
Thak you -this really confuses me

Click here to see answer by 303795(602)

Question 29275: At very long hotel in Arnold, MD, there are n rooms located along a very long corridor and numbered consecutively from 1 to n. One night after a party, n people, who have been likewise numbered 1 to n, arrived at this hotel and did as follows: guest 1 opens all the doors. Then guest 2 closed every second door beginning with door 2. Afterwards, guest 3 changed the position of every third door (that is the guest opened the doors that were closed and closed the doors that were open). In a similar way, guest 4 changed the position of doors 4,8,12,.... This process continued until each person had walked the length of the corridor. Of course, the last person, guest n, merely strolled to the end of the corridor, where the guest changed the position of door n. The question is, �Which doors were left open and which ones were left closed at the end of the process?"
Click here to see answer by 303795(602)

Question 26893: For wat intergral values of n is the expression 1n + 2n + 3n + 4n divisible by 5?
*note n values are writen in superscript*
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Question 25561: 1- Find the mesure of an angle if its measure is 3 degrees less than twice the measure of its supplement

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Question 25097: In a mixture of concrete there are 3lbs of cement mix for every 1lb of gravel. If the mixture contains a total if 140lbs of these two ingredients how many pound of gravel are there?
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Question 20123: I really need help on this problem quickly!!! I'm a AP AB Calculus student, but this extra credit problem is giving me serious issues. I can find one of the two equations and can continue no further! O.k. here it is:

"A Yankee mixes a certain number of wooden nutmegs, which cost him 1/4 cent apiece, with a quantity of real nutmegs, worth 4 cents apiece, and sells the whole assortment for $44; and gains $3.75 by the fruad. How many wooden nutmegs were there?"

I've managed this so far:
x= number of real nutmegs
y= number of fake nutmegs
The cost of the total number of nutmegs is 44 - 3.75, which equals 40.25

0.0025x + 0.04y = 40.25

Since I have two variables I need two equations. I know I need the total number of nutmegs but I don't know how to find it! Please help! It would be greatly appreciated! :)
Click here to see answer by 303795(602)

Question 65598: A corn mean feed is 10% protein and a feed supplement is 40% protein. How much of each must be conbined to get 2400 pounds of feed that is 19% protein?
Click here to see answer by ptaylor(2198)

Question 65729: A barrel contains 30 gallons of 40% antifreeze. How many gallons of an 80% antifreeze solution should be added to make the barrel contain 50% antifreeze?
Click here to see answer by stanbon(75887)

Question 65810: The volume of a quantity of an ideal gas was held constant. The inital pressure and temperature were 400 torr and 80 K. What would be the final temperature if the final pressure was 300 torr?
Click here to see answer by Edwin McCravy(20055)

Question 65848: A farmer wants to mix milk containing 6% butterfat with 2 quarts of cream that is 15% butterfat to obtain a mixture that is 12% butterfat. How much milk containing 6% butterfat must he use?
Click here to see answer by stanbon(75887)

Question 65890: The Queen Mary is a large cruise ship that has 8,12,700 cubic feet of cargo space. Express this nunmber in scientific notation.
Click here to see answer by Nate(3500)

Question 65890: The Queen Mary is a large cruise ship that has 8,12,700 cubic feet of cargo space. Express this nunmber in scientific notation.
Click here to see answer by uma(370)

Question 66303: Mix a solution that is 50% alcohol with a soution that is 20%to make 450 mL of a aolution that is 40% alcohol. How much of each solutions should you use ?
Click here to see answer by checkley71(8403)

Question 66306: A 6-quart cooling system is checked and found to be filled with a solution that is 20% antifreeze. The desired strength of the solution is 60 % antifreeze. How many quarts of solution need to be drained and replaced with pure antifreeze to reach the desired strength?
Click here to see answer by funmath(2933)

Question 66313: Mix a solution that is 30% alcohol with a solution that is 80% alcohol to make 800mL of a soultion that is 60% alcoho. How much of each solution should you use?
Click here to see answer by ankor@dixie-net.com(22740)

Question 66317: mix a solution that is 40% acid with a solution that is 100% water to make 16L of a solution that is 10% acid. How much of each solution should you use?
Click here to see answer by ptaylor(2198)

Question 66332: The weight of carbon (C) in a quantity of c3h3cl5 was 432 grams. What was the weight of the chlorine (cl) in the compound? (C,12;H,1;Cl,35)
Click here to see answer by venugopalramana(3286)

Question 66436: A 12 quart cooling system is filled with a solution that is 10% antifreeze. The desired strength of the solution is 40% antifreeze. How many quarts of solution need to be drained and replaced with pure antifreeze to reach the desired strength?
Click here to see answer by ptaylor(2198)

Question 66435: Mix a solution that is 50%alcohol with a solution that is 10% alcohol to make 300 L of a solution that is 30% alcohol. How much of each should you use?
Click here to see answer by ptaylor(2198)

Question 66467: How much water should be added to 30 gallons of a solution that is 70% antifreeze in order to get a mixture that is 60% antifreeze.
How do I go about setting up this equation? Please help!
Click here to see answer by ptaylor(2198)

Question 66574: a lab technician has one solution that is 60% chlorinated and another that is 40% chlorinated. how much of each solution is needed to make a 100 L solution that is 50% clorine?
Click here to see answer by stanbon(75887)

Question 66582: A jeweler is using 10 lbs. of an alloy that is 2% robium. He has another alloy which is 5% robium. He wishes to combine these mixtures to form a mixture that is 3% robium. How many pounds of the second alloy should be added to the first to get a mixture that is 3% robium.
I really need help, so I would ask for step by step instructions please.
Thank you.

Click here to see answer by stanbon(75887)

Question 66644: 34. Sleep Deprivation
In a recent study, volunteers who had 8 hours of sleep were three times more likely to answer correctly on a math test than were sleep-deprived participants.
(a) Identify the sample used in the study.
(b) What is the sample's population?
(c) Which part of the study represents the descriptive branch of statitics?
(d) Make an inference based on the results of the study?
Click here to see answer by stanbon(75887)

Question 66884: How many pounds of a 35% salt solution and how many pounds of a 14% salt solution should be combined so that 50 pounds of a 20% salt solution are obtained?
Click here to see answer by ptaylor(2198)

Question 66883: A candy store sells boxes of candy containing caramels and chocolates. Each box sells for $12.50 and holds 30 pieces of candy (all pieces are the same size). If the caramels cost $0.25 to produce and the chocolates cost $0.45 to produce, how many of each should be in a box to make a profit of $3.00?
Click here to see answer by ptaylor(2198)

Question 66951: Florence Flask has 500 grams of a 72% salt solution. How much water must she add to obtain a 25 % salt solution?
Click here to see answer by ptaylor(2198)

Question 67103: I'm having to do an algebra review to start off the semester. I am able to recall doing these types of problems, but it's been a while. The question is as follows:
Suppose a fuel mixture is 6% ethanol and 94% gasoline. How much ethanol (in gallons) must you add to one gallon of the fuel so that the new fuel mixture is 10% ethanol?
Click here to see answer by Nate(3500)

Question 67414: Michelle had two containers, each containing a mixture of alcohol and disinfectant. One was 40% disinfectant and the other was 80% disinfectant. How much of each should be used to get 600 milliliters of a solution that is 50% disinfectant?
Click here to see answer by ptaylor(2198)

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