Answers

2014-05-28T15:43:50+08:00
Let x be the amount (in liters) of the 10% solution that we need

4 (50%) + x (10%) = (4 + x)(20%)
Multiply both sides by 10 to cancel out the % sign

4(50) + x(10) = (4 + x)(20)
200 + 10x = 80 + 20x

Combine like terms
10x = 120
x = 12 Liters

Hope this helps :)
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