Question 360129
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Hi,
Let x represent the amount of salt added. Note: that is a 100% solution of salt.
.20*60kg + 1.00x = .40(60kg + x)***
solve for x
.6x = .20*60kg
x = 20 kg of salt needs to be added

checking out answer
12 + 20 = .40*80  = 32