How many grams of 5% solution do we need to add to 100g of 50% solution to get a 20% solution?

Correct answer:

x =  200 g

Step-by-step explanation:

0.05x +0.50•100 = 0.20•(x+100)

0.05•x +0.50•100 = 0.20•(x+100)

0.15x = 30

x = 200

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