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Question 406178: a faucet in a large tank can fill the tank in 12hrs. However there is a hose in the tank which would be able to empty the tank in 18hrs. If someone left both hoses on how long would it take to fill the tank using the faucet
Click here to see answer by Alan3354(69443)

Question 406204: How many liters of a 40% alcohol solution must be mixed with a 60 L of a 80% solution to get a 50% solution?
Click here to see answer by stanbon(75887)

Question 406396: how many liters of water must be added to 8 liters of 40% acid solution to obtain a 10% acid solution?
Click here to see answer by stanbon(75887)

Question 406512: how many gal. of a 65% saline solution must be mixed with 8gal. of pure water to make a 25% solution ?
Click here to see answer by stanbon(75887)

Question 406731: How many liters of a 10% salt solution must be mixed with 15 liters of a 40% salt solution to obtain a 20% salt solution? I have no idea how to set this eqaution up
Click here to see answer by ewatrrr(24785)

Question 406743: A merchant blends tea that sells for $5.00 a pound with tea that sells for $2.50 a pound to produce 50 lb of a mixture that sells for $3.00 a pound. How many pounds of each type of tea does the merchant use in the blend?
Click here to see answer by ewatrrr(24785)

Question 406730: The radiator in a car is filled with a solution of 60% antifreeze and 40% water. The manufacturer of the antifreeze suggests that, for summer driving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is 3.6L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?
Click here to see answer by Edwin McCravy(20056)

Question 406737: How many pounds of a 15% aluminum alloy must be mixed with 500 lb of a 22% aluminum alloy to make a 20% aluminum alloy?
Click here to see answer by ewatrrr(24785)

Question 407084: how many liters of 35% saline solution should be mixed with 65% saline solution to obtain 120 liters of 55% saline soluton?
Click here to see answer by stanbon(75887)

Question 406876: Valentine's Day will soon be here. Zarkada's Candy Store on Rhodes Avenue wants to create a mix of chocolates for $10.05per pound. It will use chocolate covered caramels that cost $10 per pound;turtles that cost $12 per pound; and chocolate kisses that cost $9 per pound. They want to use eight pounds more of the kisses than the turtles. If they decide to make 40 pounds of this candy mix, how much of each should they include.
This problem is Applications of systems of linear equations
solve the system of equations using any method
Click here to see answer by ankor@dixie-net.com(22740)

Question 407185: help me pleaseeeeeeeeeeeeee!
lemon drops are to be mixed with jelly beans to make 100 pounds of mixture.
refer to the illustration and compute how many pounds of each candy should be used.
lemon drops $1.90 lb.
jelly beans $1.20 lb.
mixture$1.48 lb.
Click here to see answer by lwsshak3(11628)

Question 407187: a nurse wants to add water to 30 ounces of a 10% solution of benzakonium chloride to dilute it to an 8% solution how much water must she add?

I'm not sure if I doing it right
8(x+30) + 0.10x
Click here to see answer by mananth(16946)

Question 407372: Canu help me correctly set up this problem...
How much of an alloy that is 30% copper should be mixed with 600oz of an alloy that is 90% copper in order to get an alloy that is 70% copper?
Click here to see answer by katealdridge(100)

Question 407392: Patrick is selling his house through a real estate agent whose commission is 6% of the selling price. What should be the selling price so that Patrick can get $84,600?
Click here to see answer by rfer(16322)

Question 407389: Lauren drove her car for 3 hours in a dust storm. When the skies cleared, she increased her speed by 30 miles per hour and drove for 4 more hours, completing her 295-mile trip. How fast did she travel during the dust storm?
Click here to see answer by ankor@dixie-net.com(22740)

Question 407390: Barry is four times as old as Nick. If the difference between their ages is 42 years, how old is Barry?
Click here to see answer by ewatrrr(24785)

Question 407815: What does mean: Give the answer in 1Watt precision.
Click here to see answer by richard1234(7193)

Question 407968: The number of farms in the United States was 2.19 million in 2000. By 2006, the number had dropped to 2.09 million. What was the percent of decrease? Round to the nearest tenth.
Click here to see answer by rfer(16322)

Question 408053: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags of 3% cement should he mix with 5 bags of 28.2% cement to produce a mix containing 12% cement.
I have been trying for two days on this problem. I have gotten different answers everytime. I am using a picture, table and still not getting it.
Please help!!
Click here to see answer by scott8148(6628)

Question 408138: A 40% saline solution is to be mixed with a 60% saline solution to obtain 8 liters of a 55% saline solution. How many liters of each solution should be used?
Click here to see answer by ewatrrr(24785)

Question 408146: A chemist mixes a 8% alcohol solution with a 14% alcohol solution to make 600 milliliters of a 12% alcohol solution. How many milliliters of each solution does the chemist use?
I need help on how to set the problem up and the answer. If possible, can you show your work, step by step?

Click here to see answer by ewatrrr(24785)

Question 408254: I am having problems figuring out what the equation is for this problem. Paula has 400 milliliters of a solution that is 80% alcohol. She plans to dilute it so that it is only 50% alcohol. How much water will she have to add in order to do this?
Click here to see answer by stanbon(75887)

Question 408436: Forty-three percent of Americans have type A molecules in their blood, 15% have type B molecules, and 46% have neither type A nor
B molecules. What percent of Americans have both type a and type b molecules in their blood?
Click here to see answer by josmiceli(19441)

Question 408464: solve using a system of equations.
I know you have to do something like x+y+x+y=, but then I get so confused.
A 40% saline solution is to be mixed with a 60% saline solution to obtain 8 liters of a 55% solution. How many liters of each solution should be used?
Click here to see answer by josmiceli(19441)

Question 408714: A hospital received a shippment of 8-milligram doses of medicine. Each 8-milligram package was repacked into two smaller dosesof unequal size and labled packet a and packet b. The hospital then used 17 doses of packet A and 14 doses of packet B in one week. The hospital used a total of 127 milligrams of the medicine during that week. How many milligrams of the medicine are contained in each A packet? In each B packet?
Click here to see answer by stanbon(75887)

Question 408726: how many gallons of 70% antifreeze needs to be added to 10 gallons of 30% antifreeze to get a 45% mix?
Click here to see answer by stanbon(75887)

Question 408729: At most, how much water can be evaporated from 300 liters of a 2% salt solution if the resulting solution is not to exceed 3% in salt content?
Click here to see answer by stanbon(75887)

Question 408716: Amount of taxes payed on $125000 is federal 50% and state 30%. The federal tax is computed after state tax paid. The state tax is computed after federal tax is paid. How much is the federal and state taxes?
Solution: Let y be the total income
Therefore, State Tax= y x 30%
=30y/100
=3y/10
Income after State Tax = y - 3y/10
= 7y/10
Now, Federal Tax= 7y/10 x 50%
= 7y/20
so total tax= 3y/10 + 7y/20
Now this total tax must be equal to 125000
Therefore,
3y/10 + 7y/20 = 125000
(6y + 7y)/20 = 125000
13y/20 = 125000
so, y = (125000 x 20)/13
y= $192307.69
State Tax= $192307.69 x 30%
=$ 57692.31
Income after state tax= $192307.69 - $ 57692.31
= $ 134615.38
So, Federal Tax = $134615.38 x 50%
= $ 67307.69

Click here to see answer by Adrish(44)

Question 408567: How many liters of a 50% acid solution must be added to 10 liters of a 15% acid solution to produce a 25% acid solution?
Click here to see answer by ewatrrr(24785)

Question 408907: Suppose that one solution contains 20% alcohol and another solution contains 50% alcohol. How many liters of each solution should be mixed to make 4.5 liters of a 40%-alcohol solution?
Click here to see answer by ewatrrr(24785)

Question 408964: Joe has lots of 8% acid solution and lots of 14% acid solution. How much of each must he combine to obtain 12 liters of 10% acid solution?
Click here to see answer by ewatrrr(24785)

Question 408969: An automobile radiator contains 16 quarts of a 20% solution of antifreeze. How much of the orginal solution must be drained off and replaced by pure antifreeze to make a 25% solution of antifreeze?
Click here to see answer by ewatrrr(24785)

Question 409145: ALREADY SOLVED: Thanks

Click here to see answer by Jeef Gorrdon(26)

Question 409152: A chemist has two solutions of H2s04. One has a 40% concentration and the other has a 25% concentration. How many liters of each solution must be mixed to obtain 77 liters of a 28% concentration?
Solved my last mixture problem on my own and now I am stumped on this one.
Can someone help explain this? Please :)
Click here to see answer by Jeef Gorrdon(26)

Question 409134: How many liters of a 50% acid solution must be mixed with 25% acid solution to get 250 L of a 40% acid solution?
And can you guide me step by step. I was a bit confused on how to get the answer.
I know Mixture:amount x concentrate
and the table, but putting it all together is confusing me
Click here to see answer by josmiceli(19441)

Question 408947: Terry and Abigail are moving to a new house. They have 13 books on one shelf of their bookcase, but the narrow box Terry is packing can only hold a stack of 12 books. Abigail is convinced that all 13 books will fit if only they are stacked in the correct order. She tries several possible ways of stacking the books before giving up and admitting that she was wrong - only 12 books can fit. If Abigail had persisted and tried every possible way of stacking the books, how many different orders would she have had to try?

Click here to see answer by solver91311(24713)

Question 409246: to dilute a solution that is 40% saline, a chemist combines it with a solution that is 15% saline. How much of each solution should she use if she needs 150mL of a solution that is 25% saline?
Click here to see answer by stanbon(75887)

Question 409421: One cleaning fluid contains 6% ammonia, while a second contains 26% ammonia. In blending these fluids, how many liters of the second must be added to 10 liters of the first, if the ammonia in the mixture is to be 16%?
Click here to see answer by stanbon(75887)

Question 409482: How many gallons of a 50% salt solution must be mixed with 30 gallons of a 17% solution to obtain a solution that is 40% salt?
Click here to see answer by ewatrrr(24785)

Question 409515: ben bowled 147 and 186 in his first two games.what must he bowl in his third game to have an average of at least 170?
Click here to see answer by ewatrrr(24785)

Question 409872: How many liters of a 70% alcohol solution must be added to 50 liters of a 40% alcohol solution to produce a 30% alcohol solution?
Click here to see answer by fractalier(6550)

Question 409869: three more than twice a number is less than negative thirteen
Click here to see answer by rfer(16322)

Question 409981: What is the range of the function y = x^2?
Click here to see answer by ewatrrr(24785)

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