Question 159795
how many pounds of water must be evaporated from 50lbs of a 3% salt solution so that the remaining solution will be a 5% salt?
:
Let x = amt of water to be evaporated
:
Write amt of salt equation(amt of salt remains the same, amt of water changes):
.03(50) = .05(50-x)
:
1.5 = 2.5 - .05x
:
1.5 - 2.5 = -.05x
:
-1 = -.05x
x = {{{(-1)/(-.05)}}}
x = 20 lb of water to be evaporated
:
:
Check for equality of salt amt
.03(50) = .05(50 - 20)
1.5 = .05(30)
1.5 = 1.5