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Question 1163703: A pharmacist wishes to mix a solution that is 4% Minoxidil. She has on hand 90 ml of a 2% solution and wishes to add some 6% solution to obtain the desired 4% solution. How much 6% solution should she add?
Click here to see answer by MathTherapy(10551)

Question 1163773: In order to make a necklace, Alicia purchased a bag of 80 beads for a total of 39.00. Some of the beads were sterling silver and cost .40 each, and the rest were gemstone beads that cost .65. How many of each type of bead were in the bag?
Click here to see answer by Boreal(15235)

Question 1163785: The mad scientist has one solution that is 30% acid and another solution that is 18% acid. How much of each should he use to get 300 L of a solution that is 21% acid?
Click here to see answer by josgarithmetic(39616)

Question 1163895: Shera wants to make a 55% acid solution. She has already poured 1 ml of a 30% acid solution into a beaker. How many ml of a 60% acid solution must she add to this to create the desired mixture? *
Click here to see answer by josgarithmetic(39616)

Question 1163904: It has been estimated that there is 4.00 × 10^-4 mg of gold per liter of seawater. At price of $19.40/g, what would be the value of the gold in 9.87 km3 (1 km3 = 1 × 10^15 cm3) of the ocean?
Click here to see answer by josgarithmetic(39616)

Question 1164359: A coffee merchant combines coffee that costs $7 per pound with coffee that costs $3.30 per pound. How many pounds of each should be used to make 25 lb of a blend costing $5.89 per pound?

Click here to see answer by ankor@dixie-net.com(22740)

Question 1164398: An actor invested some money at 5% simple interest, and $45,000 more than twice the amount at 6% . The total annual interest earned from the investment was $14090.how much did invest at each amount?
Click here to see answer by ikleyn(52776)

Question 1164545: A delivery truck is transporting boxes of two sizes: large and small. The combined weight of a large box and a small box is 90 pounds. The truck is transporting 60 large boxes and 65 small boxes. If the truck is carrying a total of 5550 pounds in boxes, how much does each type of box weigh?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1164554: A merchant blends tea that sells for $5.25 a pound with tea that sells for $2.75 a pound to produce 70 lb of a mixture that sells for $3.75 a pound. How many pounds of each type of tea does the merchant use in the blend?
Click here to see answer by solver91311(24713)

Question 1164642: a) In how many different ways can the letters of the word KNOWLEDGE be arranged in such a way that the vowels always come together?
b) In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
c) From sale force of 150 persons, one will be selected to attend a special sales meeting. If 52 of them are unmarried, 72 are college graduates, and ¾ of the 52 that are unmarried are college graduates, find the probability that the sales person selected at random will be neither single nor a college graduate.
d) A jar contains 3 red. 5 green, 2 blue and 6 yellow marbles. A marble is chosen at random from the jar. After replacing it, a second marble is chosen. What is the probability of choosing a green and then yellow marble?

Click here to see answer by ikleyn(52776)

Question 1164910: An herbalist has 15 oz of herbs costing $3 per ounce. How many ounces of herbs costing $2 per ounce should be mixed with these 15 oz of herbs to produce a mixture costing $2.20 per ounce?
Click here to see answer by josgarithmetic(39616)

Question 1164940: The gasoline tank of a car contains 50 liters of gasoline and alcohol, the alcohol comprising 25%. How much of the mixture must be drawn off and replaced by alcohol so that the tank contain a mixture of which 50% is alcohol?
Click here to see answer by Boreal(15235)

Question 1165119: A dairy needs 244 gallons of milk containing 7% butterfat. How many gallons each each of milk containing 9% butterfat and milk containing 1% butterfat must be used to obtain the desired 245 gallons?
Click here to see answer by greenestamps(13198)

Question 1165214: Kyle is treating his years for weeds with a special solution. The bag says to mix 1/2 cup of solution with 5 gallons of water for a 3 acre yard. Kyles yard is 1.5 acres. How much solution should Kyle mix with 5 gallons of water to make sure he has the correct amount of solution.
Click here to see answer by josgarithmetic(39616)

Question 1165238: How many gallons of a 60% antifreeze solution must be mixed with 70 gallons of 25
% antifreeze to get a mixture that is 50% antifreeze?
Click here to see answer by josgarithmetic(39616)

Question 1165368: A nontoxic furniture polish can be made by combining vinegar and olive oil. The amount of oil should be three times the amount of vinegar. How much of each ingredient is needed in order to make 14 oz of furniture polish?
Click here to see answer by josgarithmetic(39616)

Question 1165372: nontoxic furniture polish can be made by combining vinegar and olive oil. The amount of oil should be five times the amount of vinegar. How much of each ingredient is needed in order to make 33 oz of furniture polish?
Click here to see answer by ikleyn(52776)

Question 1165376: The owner of a candy store mixes two types of candies she decides to create a 20 pound mixture that has both raspberry flavored gum drops and cherry flavored jellybeans the gum drops so 40.95 per pound and the jellybeans sell for 1.20 per pound she plans to sell the mix for 1.10 per pound how many pounds of each candy should she use in her mix
Click here to see answer by josgarithmetic(39616)

Question 1165509: A 560-gram salt-and-water solution contains 60 g of salt. This mixture is left in the open air, and 80 g of water evaporates from the solution. What is the percent concentration of salt in the remaining solution?
Click here to see answer by josgarithmetic(39616)

Question 1165489: A flask contains 500 ml of an 80% alcohol solution in water. How much of this solution must be drawn off
and replaced by water to obtain a solution having a concentration of 25% alcohol?
Click here to see answer by josgarithmetic(39616)

Question 1165525: How many pounds of extra-lean hamburger that is 7%fat must be mixed with hamburger that is 15% fat to obtain a mixture of 30 pounds of hamburger that is 10% fat?
Click here to see answer by Boreal(15235)

Question 1165528: How many gallons of a 20% antifreeze solution and a 15% antifreeze solution must be mixed to obtain 30 gal of a 19% antifreeze solution? Round to the nearest gallon, if necessary.
Click here to see answer by Boreal(15235)

Question 1165562: To create 10 L of a 15% acid solution, Julia decides to mix a 10% acid solution with a
30% acid solution. How many liters of the 10% acid solution and how many liters of the 30% acid
solutions should she use?
Click here to see answer by josgarithmetic(39616)

Question 1165689: A mixture is made by combining 1.88Ib of salt and 4.62Ib of water.
What is the percentage of salt (by mass) in this mixture?

Click here to see answer by josgarithmetic(39616)

Question 1165827: A flask contains 500 ml of an 80% alcohol solution in water. How much of this solution must be drawn off and replaced by water to obtain a solution having a concentration of 25% alcohol?
Click here to see answer by ikleyn(52776)

Question 1165932: A container is filled with 70 liters which is 40% alcohol by volume. How much of a mixture must be taken and then replaced with equal amount of water so that the resulting solution is 30% alcohol by volume?
Click here to see answer by ikleyn(52776)

Question 1166059: The left bank is offering CD�s at 5%. The right bank is offering a money market account at 4%. If I have a total of $10,000 to invest in these accounts and want to earn $436 in interest at the end of one year, how much should I put into each account?
Click here to see answer by dkppathak(439)

Question 1166104: Last year, Ivanna had $10,000 to invest. She invested some of it in an account that paid 6% simple interest per year, and she invested the rest in an account that paid 9% simple interest per year. After one year, she received a total of $660 in interest. How much did she invest in each account?
First account?
Second account?

Click here to see answer by josgarithmetic(39616)

Question 1166207: A merchant mixed 8 lb of a cinnamon tea with 2 lb of spice tea. The 10-pound mixture cost $16. A second mixture included 16 lb of the cinnamon tea and 8 lb of the spice tea. The 24-pound mixture cost $40. Find the cost per pound of the cinnamon tea and of the spice tea.
cinnamon dollars per pound
spice dollars per pound

Click here to see answer by josgarithmetic(39616)

Question 1166206: A carpenter purchased 60 ft of redwood and 70 ft of pine for a total cost of $276. A second purchase, at the same prices, included 80 ft of redwood and 50 ft of pine for a total cost of $316. Find the cost per foot of redwood and of pine.
redwood dollars per foot
pine dollars per foot

Click here to see answer by josgarithmetic(39616)

Question 1166296: A sugar solution is 23.4 % by mass. How many grams of solution contain 55.7 g of sugar?
Click here to see answer by greenestamps(13198)

Question 1166325: A major coffee supplier has warehouses in Seattle and San Jose.
The coffee supplier receives orders from coffee retailers in Salt Lake City and Reno.
The retailer in Salt Lake City needs 400 pounds of coffee and the retailer in Reno needs 350 pounds of coffee.
The Seattle warehouse has 700 pounds available,
and the warehouse in San Jose has 500 pounds available.
The cost of shipping from Seattle to Salt Lake City is $2.50 per pound,
from Seattle to Reno $3.50 per pound,
from San Jose to Salt Lake City $2 per pound
and from San Jose to Reno $2.50 per pound.
Find the number of pounds to be shipped from each warehouse to each retailer to minimize the cost.

Click here to see answer by ikleyn(52776)

Question 1166336: Yasmine bought 6 gallons of apple juice. After filling up 4 bottles of the same size with apple juice she had 0.3 gallon of apple juice left. whats the amount of juice in each bottle?
Click here to see answer by ikleyn(52776)

Question 1166373: Dale rented a truck for one day. There was a base fee of $9.00, and there was an additional charge of 6 cents for each mile driven. The total cost, C (in dollars ), for driving x miles is given by the following.
C= 9.00 + 0.06x
What is the total rental cost if Dale drove 30 miles?
Click here to see answer by Alan3354(69443)

Question 1166475: Two hundred milliliters of 2% acetic acid are needed. How many milliliters of 10% acetic acid are required to make the 2% solution?
Click here to see answer by josgarithmetic(39616)

Question 1166476: Give instructions for preparing 250 ml of a 100 mM solution of Mg(OH)2 (FW=58).
Click here to see answer by ikleyn(52776)

Question 1166476: Give instructions for preparing 250 ml of a 100 mM solution of Mg(OH)2 (FW=58).
Click here to see answer by Boreal(15235)

Question 1166486: Find the number of gallons of a 15% acid, 75% acid, and 60% that are required to make 100 gallons of 51% acid. If the sum of three times the number of gallons of a 15% acid and a 75% acid is thirty more than the number of gallons of 60% acid?
Click here to see answer by josgarithmetic(39616)

Question 1166490: A Sunshine Paint store has some number of gallons of paint containing 15% oil-base, 75% oil-base, and 60% oil-base. The store wants to make 128 gallons of 51% oil-base. If the sum of three times the number of gallons of a 15% oil-base, and a 75% oil-base is thirty more than the number of gallons of 60% oil-base, then find the number of gallons of each type of paint.
Click here to see answer by josgarithmetic(39616)

Question 1166586: A beaker contains 500ml of an 11% solution. How much water should be evaporated to obtain a solution that is at least 12% alcohol?
Click here to see answer by josgarithmetic(39616)

Question 1166772: How many cups of pure water should be mixed with 9.5 cups of a 70% acid soulution to dilute it into a 5% acid soulution?
Click here to see answer by josgarithmetic(39616)

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