Distilled water

Sea water contains 5% salt. How many distilled water should be pour to 40 kg of sea water so that the salt content is 2%. How many kilograms of 2% of sea water we get?

Correct result:

x =  60
y =  100


y = x+40

0.02y = 2
x-y = -40

x = 60
y = 100

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