Question

Bob the builder is making 480 kg of concrete mix

concrete is made by mixing cement, sand and gravel in the ratio 1 : 3 : 4

how much sand does he need?

Answer 1

If sand is 3 in the ratio, it is 180kg

Explanation:

480/8=60 60 times 3 is 180

Answer 2

180 kg

Explanation:

The ratio is

cement : sand : gravel

1 : 3 : 4

If he used 1 kg cement, 3 kg sand, and 4 kg gravel, he'd get 8 kg of concrete.

He wants to make 480 kg of concrete.

480/8 = 60

He needs 60 times more concrete than the numbers in the ratio.

60 * 3 kg = 180 kg

Answer: 180 kg