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Question 491876: Please help
A tank holds 30 liters of a chemical solution. Currently, the solution has a strength of 60%. How much of this should be drained and replaced with a 90% solution to get a final strength of 80%?
How many liters should be drained and replaced with 90 % solution
Click here to see answer by stanbon(75887)

Question 491878: Please answer this question:
How much water must be evaporated from 32 pounds of a 4% solution of salt and water to make the result a solution that is 6% salt.
Click here to see answer by lwsshak3(11628)

Question 491710: The formula occurs in the indicated application. Solve for the specified variable.
S = p/(q + p(1 − q))
for p (Amdahl's law for supercomputers)

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

Question 492653: A nut store usually sells cashews for $4.60 per pound and peanuts for $2.20 per pound. At the end of the month, the peanuts had not sold well. In order to sell 36 pounds of peanuts, the manager decided to mix the 60 lb of peanuts with some cashews and sell the mixture for $2.80 per pound. How many pounds of cashews should be mixed with the peanuts to ensure no change in the profit? (the value remains the same)
Click here to see answer by mananth(16946)

Question 492614: determine how many liters of a 7 percent acid solution and how many liters of a 12 percent acid solution should be mixed by a chemist to obtain 6 liters of a 10 percent acid solution.

Click here to see answer by chessace(471)

Question 492605: Kiera wants to make a solution that is 60% Alcohol. How many liters of a 70% Alcohol solution should Kiera add to 12 liters of a 45% Alcohol solution to achieve her goal?
Click here to see answer by mananth(16946)

Question 492752: i am trying to get the equation for a mixture problem.
You have 7 ounces of 30% glucose solution. How much 30% glucose solution and how much water needs to be used to make 7 ounces of 20% solution?
my equation i tried is
.30(7) + x = .20(7-x)
is this the right equation to start the problem?
Thank you for the help
Click here to see answer by stanbon(75887)

Question 492762: Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their present ages.
Click here to see answer by stanbon(75887)

Question 492778: How much salt must be added to 80 pounds of a 5% salt solution to make a 24% salt solution?
Click here to see answer by stanbon(75887)

Question 492982: (1 pt) What quantity of 65 per cent acid solution must be mixed with a 30 percent solution to produce 630 mL of a 50 per cent solution?

Click here to see answer by josmiceli(19441)

Question 493048: How many grams of NaCl would need to be added to 1 liter of water to make a 10% solution of NaCl?
Click here to see answer by josmiceli(19441)

Question 493024: What weight of an alloy containing 10% silver must be melted with an alloy containing 60% silver to obtain 10 lb of an
alloy containing 40% silver?
Click here to see answer by josmiceli(19441)

Question 493426: A coffee company wants a new flavor of Cajun coffee. How many pounds of coffee worth $6 a pound should be added to 30 pounds of coffee worth $3 a pound to get a mixture worth $4 a pound?
Click here to see answer by josmiceli(19441)

Question 493651: How many gallons of cream that is 20% butterfat must be mixed with milk that is 2% butterfat to get 18 gallons of milk containing 4% butterfat?
I am having trouble setting up the equation. We were thinking it went something like this...
.02x + .2x = .04(18)
Click here to see answer by stanbon(75887)

Question 493739: if 118 ml (4 oz) of sunscreen cost 12.00. How much does 100 ml (3.38 oz) cost?
Click here to see answer by rfer(16322)

Question 493792: The problem is two parts:
part 1: A temporary agency offers two payment options:
Option 1: $25 daily fee plus $10/hour
Option 2: No daily fee but $15/hour
Write a mathematical model representing the total temp cost,C, for a FOUR day temporary administrative assistant in terms of x for the following.
Option 1: C=
Option 2: C=
Part 2: How many total hours would the temp need to work in the four day period for the cost of Option 1 to be less than Option 2. Set up an inequality and show your work algebraically using the information in part 1. Don't forget about the daily fee in Option 1 (it's a four day proposition).
Click here to see answer by swincher4391(1107)

Question 493815: A pharmacist wishes to mix a solution that is %8 Minoxidil. She has on hand 90 ml of a 1% solution and wishes to add some 10% solution to obtain the desired 8% solution. How much 10% solution should she add?
Click here to see answer by stanbon(75887)

Question 494210: a chemist needs 100 millimeters of a 76% solution but has only 55% and 85% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
Click here to see answer by chessace(471)

Question 494254: I have a gallon of 32% HCL and wish to dilute to 15% HCL. How do I figure the ratio of HCL to water
Click here to see answer by chessace(471)

Question 494329: How many liters of an 8% solution of salt should be added to a 25% solution in order to obtain 510 liters of an 12% solution?
I tried many different ways to solve this probelm:
.08x +.25(510-x)=510?
.25x+.08(.12-x)=510?
but none of this come out with the correct answer if you could please help i would greatly appreciate it! Also if you could possibly tell me where i am going wrong? THANK YOU!! In advanced
Click here to see answer by chessace(471)

Question 494416: The owner of a store sells raisins for $3.20 per pound and nuts for $2.40 per pound. He decides to mix the raisins and sell 50lb of mixture for $2.72 per pound. What quantities of raisins and nuts should he use?
Click here to see answer by htmentor(1343)

Question 494727: the sum of two numbers is 62. their difference is 16. find the numbers.

Click here to see answer by Jstrasner(112)

Question 494722: the sum of two numbers is 62. their difference is 16. find the numbers.

Click here to see answer by Maths68(1474)

Question 495118: Lisas tuna salad recipe calls for 4 tablespoons of mayonnaise for every 3lb of tuna fish. How many tablespoons of mayo does she need to make 10lb of tuna salad?
Click here to see answer by rfer(16322)

Question 495150: How much water must you add to a 40 L 80% acid solution to reduce it to 20% acid?
Click here to see answer by stanbon(75887)

Question 494593: The number of pounds in y ounces
Click here to see answer by bucky(2189)

Question 495151: Please help me solve this mixture word problem:
A certain mixture consists of acid and water. If 5 gallons of acid is added to the mixture, it willl produce a mixture that is one-half acid and one-half water. If, on the other hand, 5 gallons of water is added, the resulting mixture is one-third acid. How many gallons of acid does the original mixture contain?
Click here to see answer by ankor@dixie-net.com(22740)

Question 495346: Soybean meal is 16% protein, cornmeal is 8% protein. How many pounds of each should be mixed together in order to get 320-lb mixture that is 11% protein?
Click here to see answer by ptaylor(2198)

Question 495507: Solution A is 50% alcohol. Solution B is 20% alcohol. We want to create a 20 liter mixture of the two solutions that will be 32% alcohol. How many liters of each solution should be used?
Click here to see answer by josmiceli(19441)

Question 495605: A pot contains 2 L of brine at a concentration of 90 g/L. How much of the water should be boiled off to increase the concentration to 180 g/L
Click here to see answer by ptaylor(2198)

Question 495618: How many liters of pure water should be mixed with a 13-L solution of 90% acid to produce a mixture that is 70% water?
Click here to see answer by Alan3354(69443)

Question 495706: Theophylline, an asthma medicine, is to be prepared from an elixir with a drug concentration of 5 mg/mL and a cherry - flavored syrup that is to be added to hide the taste of the drug. How much of each must be used to prepare 100 milliliters of solution with a drug concentration of 2 mg/mL?

Click here to see answer by stanbon(75887)

Question 495789: how much pure acid should be mixed with 4 gallons of 50% acid solution in order to get 60% acid solution?
Click here to see answer by josmiceli(19441)

Question 495967: A solution of 49% vinegar is to be mixed with a solution of 32% vinegar to form 153 liters of a 40% solution. How many liters of 49% solution must be used?
Click here to see answer by nerdybill(7384)

Question 495970: how many quarts of pure antifreeze must be added to 2 quarts of a 10% antifreeze to obtain 20% antifreeze solution
Click here to see answer by nerdybill(7384)

Question 496024: 6 gal of a 28% saline solution was mixed with 3 gal of a 82% solution. Find the concentration of the new mixture.
Click here to see answer by Alan3354(69443)

Question 496101: Jennifer needs to make a solution that is 30% hydrochloric acid. If she must use all of the 25 mL of 60% hydrochloric acid she started with, then how much water needs to be mixed with the original solution?

Click here to see answer by Alan3354(69443)

Question 496666: a pharmacist wishes to mix a solution that is 3% minoxidil she has on hand 60 ML of a 2 % solution she wishes to add some 5% solution to obtain the desired 3%solution. how much 5%solution should she add?
Click here to see answer by lwsshak3(11628)

Question 497191: Only the 1, +, -, X, /, (, ) and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times?
Click here to see answer by richard1234(7193)

Question 497429: how much water must be added to 300 litre of a solution so that its concentration may change from 25% to 20%
%
Click here to see answer by lwsshak3(11628)

Question 497505: How much 10% acid solution and 30% acid solution should be mixed together to yield 100 liters of a 25% acid solution?
Click here to see answer by mananth(16946)

Question 497497: How much 10% acid solution and 30% acid solution should be mixed together to yield 100 liters of a 25% acid solution?
Click here to see answer by mananth(16946)

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