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Question 801750: A chemist has two alloys, one of which is 5% gold and 15% lead and the other which is 40% gold and 50% lead. How many grams of each of the two alloys should be used to make an alloy that contains 42.5 g of gold and 92.5 g of lead?
Click here to see answer by lwsshak3(11628)

Question 801760: A contractor estimated that 30 ft3 of cement is required to make a concrete floor that measures 90 ft2. Using this estimate, find how many additional cubic feet of cement would be required to make a concrete floor that measures 450 ft2.

Click here to see answer by Cromlix(4381)

Question 801838: If 100 gallons of a 75% glycerin solution is made up by conbinding a 30% glycerin soulition with a 90% glycerin solution, how many gallons of each a solution must be used??
Click here to see answer by wilft1(217)

Question 801623: Jason has saved $640. This is one tenth of the amount he needs to buy a new computer. How much is the new computer ?

Click here to see answer by Cromlix(4381)

Question 801979: chang's coffee shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Chang $4.10 per pound, and type B coffee cost $5.90 per pound. This month's blend used twice as many pounds of type B coffee as type A, for a total cost of $461.10. How many pounds of type A coffee were used?
Click here to see answer by josmiceli(19441)

Question 802151: peanutes worth $2.90 a pound were mixed with cashews worth $4.60 a pound to produce a mixture worth $3.50 a pound. How many pounds of each kind were used to produce 51 pounds of the mixture?
Click here to see answer by mananth(16946)

Question 802167: Roberta mixed together 20 ounces of tea that costs 3.25 per ounce with an unknown amount of tea that cost 4.50 per ounce. She sold all the mixture at 4.00 per ounce.
How many ounces of 4.50 tea did she add if she just broke even?

Click here to see answer by josgarithmetic(39617)

Question 802208: Phil has a 10% acid solution, but he wants to increase the strength to 20%. If he has 50 g of the solution, how much acid must he add?
Click here to see answer by josgarithmetic(39617)

Question 802272: A pharmacist had a 12% solution and a 5% solution. How much of each must be used to get a 70 L of a mixture that is 8%?
Click here to see answer by solver91311(24713)

Question 802325: we are given 5 quarters ofo milk that is 5% butterfat. how much pure butterfat is in the milk?
Click here to see answer by josmiceli(19441)

Question 802380: How many liters of 60% alcohol solution and 30% alcohol solution must be mixed to obtain 12 liters of 40% alcohol solution?

Click here to see answer by josmiceli(19441)

Question 802380: How many liters of 60% alcohol solution and 30% alcohol solution must be mixed to obtain 12 liters of 40% alcohol solution?

Click here to see answer by richwmiller(17219)

Question 802466: A chemist wants to make 52 mL of a 17% acid solution by mixing a 11% acid solution and an 19% acid solution. How many milliliters of each solution should the chemist use?
Click here to see answer by richwmiller(17219)

Question 802463: A chemist wants to make 52 mL of a 17% acid solution by mixing a 11% acid solution and an 19% acid solution. How many milliliters of each solution should the chemist use?
Click here to see answer by mananth(16946)

Question 802493: How much of a 20% acid solution should be added to 10 L of a 60% acid solution to make a 25% acid solution?
Click here to see answer by mananth(16946)

Question 802465: i was delivered 500 gallons of sodium hydroxide 50% solution how much water needs to be added to get a 40% concentrate
Click here to see answer by josmiceli(19441)

Question 802939: You need a(n) 10% acid solution, which you'll get by adding a(n) 15% acid solution to 18 liters of a(n) 7% acid solution. How many liters must be added?
The amount of the 15% solution to be added is?
Click here to see answer by mananth(16946)

Question 803059: hat quantity of 80 percent acid solution must be mixed with a 20 percent solution to produce 600 mL of a 50 percent solution?

Click here to see answer by josgarithmetic(39617)

Question 803059: hat quantity of 80 percent acid solution must be mixed with a 20 percent solution to produce 600 mL of a 50 percent solution?

Click here to see answer by Alan3354(69443)

Question 803103: How much active ingredient would you weigh to make 100 ml of a 50% solution
Click here to see answer by Alan3354(69443)

Question 803145: Amanda wants to make 8 gal. of a 20% saline solution by mixing together a 56% saline solution and a 8% saline solution. How much of each solution must she use?
Click here to see answer by josgarithmetic(39617)

Question 803228: How to change a 50% solution of magnesium sulfate to a 20% solution. Mag sulfate 1G/2ml.
Click here to see answer by josmiceli(19441)

Question 803248: directions call for mixing 8 ounces of powder to 51 gallons of water, I only need enough powder for 5 gallons of water. How much powder do I use?
Click here to see answer by josmiceli(19441)

Question 803249: If it's 6:30, what time will it be in two and one-fourth hours later.
Click here to see answer by Alan3354(69443)

Question 803293: A jeweler has 6 rings, each weighing 18 g, made of an alloy of 7% silver and 93% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 81%. How much silver should she add?
Click here to see answer by josgarithmetic(39617)

Question 803320: A chemist has a 100 mL beaker of a 30% solution.
a. Write an equation for the concentration of the solution after adding x mL of pure water.
b. Use that equation to determine how many mL of water should be added to obtain a 7% solution. Round your answer to 1 decimal place.
Click here to see answer by stanbon(75887)

Question 803344: How many liters of pure alcohol must be added to 20 liters of 20 percent solution to obtain a 80 percent solution?
Click here to see answer by mananth(16946)

Question 803346: Solve: 5z-[2z-(8z-9)]
Click here to see answer by rfer(16322)

Question 803403: If you dilute 35 gal of a 40% acid solution with 7 gal of water, what is the amount and strength of the mixture?
Click here to see answer by KMST(5328)

Question 803468: Pure acid is to be added to a 5% acid solution to obtain 95L of 45% solution. What amounts of each should she use?
Click here to see answer by Alan3354(69443)

Question 803511: A chemist wishes to make 3 liters of a 7% acid solution by mixing a 9% acid solution and a 4% acid solution. How many liters of each solution should the chemist use?
Click here to see answer by Alan3354(69443)

Question 803630: How many kilograms of nickel silver containing 15% zinc and how many kilograms of nickel silver containing 30% zinc must be melted together to produce 704 kg of a new nickel silver containing 20% zinc?
Treat the percents given in this exercise as exact numbers, and work to three significant digits.
Click here to see answer by Alan3354(69443)

Question 803659: What quantity of a 50% acid solution must be mixed with a 20% solution to produce 150mL of a 40% solution?
A. 90mL
B. 60mL
C. 50mL
D. 100mL
E. 120mL
Show work
Click here to see answer by mananth(16946)

Question 803713: How many mL of acid are there in 3.6 liters of a 5% acid solution (by volume)?
Click here to see answer by josgarithmetic(39617)

Question 803701: A liquid medicine solution is 11% liquid Curitall by volume. To the nearest mL, how much solution do you need to have 40 mL of pure Curitall?
Click here to see answer by josgarithmetic(39617)

Question 803689: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 60% antifreeze?
Click here to see answer by ankor@dixie-net.com(22740)

Question 803954: If sally can paint a house in 4 hours and John can paint a house in 6 hours, how long does it take them together.
Click here to see answer by Alan3354(69443)

Question 803982: A chemist has 2 solutions in a stock room. One is 30% acid solution, and the other is a 70% acid solution. How many ml of each should be added to obtain 100ml of a 40% solution?
Click here to see answer by Alan3354(69443)

Question 804021: How much 85% acid solution must be added to 50ml of a 25% acid solution to produce a mixture that is at 60%acid?

Click here to see answer by stanbon(75887)

Question 804046: Chemist has 10% solution and 60%solution; how many liters of each solution does the chemist need to make 200 liters of a solution that is 50%acid?
Click here to see answer by richwmiller(17219)

Question 804074: a 100% concentrate is to be mixed with a mixture having a concentrate of 30% to obtain a 50 gallon mixture of 80%. How much of the 100%concentrate will be needed
Click here to see answer by mananth(16946)

Question 804110: chocolate drops are $2.30 per pound, gumdrops are $1.50 per pound. You want a total of 50 pounds that is worth $2.10 per pound. How many pounds of each should you use?
You want a total of 50 pounds that is worth $1.00 per pound. Can you do this? Explain.
Click here to see answer by erica65404(394)

Question 804206: What equation or how do I work out how much sugar is in 200ml of a 20% sugar solution?
Click here to see answer by josmiceli(19441)

Question 804206: What equation or how do I work out how much sugar is in 200ml of a 20% sugar solution?
Click here to see answer by richwmiller(17219)

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