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Mark is making concrete. Concrete is made by mixing cement, sand, and gravel in the ratio 1:2:3. Mark wants to make 300 kg of concrete.

(a) How much cement does Mark need?
(b) How much sand does Mark need?
(c) How much gravel does Mark need?

Answer :

Final answer:

Mark needs 50kg of cement, 100kg of sand, and 150kg of gravel.

Explanation:

To find the amounts of cement, sand, and gravel needed, we can use the given ratio of 1:2:3. Since the ratio adds up to 6 (1+2+3), we can divide the total weight of the concrete (300kg) by 6 to find the weight of each component in the ratio. (a) Mark needs 1/6 of 300kg, which is 50kg of cement. (b) Mark needs 2/6 of 300kg, which is 100kg of sand. (c) Mark needs 3/6 of 300kg, which is 150kg of gravel.

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