How much water must be evaporated from 400 pounds of a 10% salt solution to yield a solution that is 16% salt.

Question

Solve and type an equation

Answer 1

10% of 400 pounds is 40 pounds

 

so there's 40 pounds of salt in the solution

 

total amount of solution new 16% = x

 

16% of the new solution is equal to the 40 pounds of salt

 

(.16)(x) = 40

 

x = 40/.16

 

x = 250

 

if the new solution is 250 pounds, then that's 150 pounds less than before evaporation when it was 400 pounds

 

150 pounds of water must evaporate