Question

A certain solution of salt water is 10% salt and weighs 50 pounds. More salt must be added to produce a solution that is 25% salt.

If x represents the pounds of salt to be added, which of the following expressions represents the number of pounds of salt in the 25% solution?

Answer 1

10% x 50=5 lbs
5 +x(pure salt)=0.25(50+x)
5+x=12.5+0.25x
7.5=.75x
x=10
15=.25x60
10 lbs of pure salt needs to be added to the mix
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