SOLUTION: Florence Flask has 500 grams of a 72% salt solution. How much water must she add to obtain a 25 % salt solution?

Question 66951: Florence Flask has 500 grams of a 72% salt solution. How much water must she add to obtain a 25 % salt solution?
Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!

Let x=amount of water to be added
Now we know that the amount of pure salt in the solution before the water is added (.72)(500) is equal to the pure salt in the solution after the water is added (.25)(500+x). So our equation to solve is:
(.72)(500)=(.25)(500+x) get rid of parens by multiplying out:
360=125+.25x subtract 125 from both sides
360-125=125-125+.25x
235=.25x divide both sides by .25
x=940 grams----------------amount of water to be added
CK
500(.72)=.25(500+940)
360=.25(1440)
360=360

Hope this helps-------ptaylor

RELATED QUESTIONS
How much water must be evaporated from 500 grams of a 10% salt solution to obtain a 15%... (answered by ankor@dixie-net.com)

bunson beaker has 150 grams of a 50% salt solution. how many grams of water must be added (answered by josgarithmetic)

A chemist has 400g of salt solution that is 10% salt. How many grams of 20% salt... (answered by jorel1380)

A chemist has 10g of a 20% salt solution. How many grams of water should she add to... (answered by josgarithmetic)

A salt solution of 15 l contains 20% salt,how much water you must add to salt solution... (answered by stanbon)

John has 20 grams of a 20% of salt solution. How much salt should he add to make it a 25% (answered by VFBundy)

how much water must be evaporated from 300 ounces of 12% salt solution to obtain a 15%... (answered by Alan3354)

A certain solution of salt water is 15% salt and weighs 35 pounds. How much salt must be... (answered by rapaljer)

a certain solution of salt water is 15% salt and weighs 35 pounds. how much salt must be... (answered by josmiceli)