In a circle, see a capital P, a line down the mark in English

In a circle, see a capital P, a line down the mark in English


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The ratio of cement, sand and stone is 2:3:5. How many tons of cement, sand and stone are needed to mix 20 tons of such concrete?


Cement: 20 × 22 + 3 + 5 = 4 (tons), sand: 20 × 32 + 3 + 5 = 6 (tons), stone: 20 × 52 + 3 + 5 = 10 (tons). Answer: need 4 tons of cement, 6 tons of sand, 10 tons of stone