A solution

A solution of salt and water has 15% salt by weight. From it, 30 kg evaporated, and the solution now contains 20% salt. Find the original quantity of the solution.

Correct answer:

x =  120 kg

Step-by-step explanation:

r1=15%=10015=203=0.15 r2=20%=10020=51=0.2 w=30 kg  r1 x=r2 (xw) 0.15 x=0.2 (x30)  0.05x=6  x=0.056=120  x=120=120 kg

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