Sea water

Seawater contains about 5% salt. How many dm3 of distilled water must we pour into 39 dm3 of seawater to get water with 1.6% salt?

Correct answer:

V =  82.88 dm3

Step-by-step explanation:

V1​=39 dm3   5 % ⋅  V1​ = 1.6 % ⋅  (V1​+V) 5/100 ⋅  V1​ = 1.6/100 ⋅  (V1​+V)  5⋅ V1​=1.6⋅ (V1​+V) 5⋅ 39=1.6⋅ (39+V)  1.6V=132.6  V=1.6132.6​=82.875  V=8663​=82.875=8663​ dm3=82.88 dm3

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