Question

Bob the builder is making 480kg on 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

the answer is 180

Explanation:

Answer 2

The amount of sand builders need is 180 kg.

Explanation:

It is given that the Bob the builder is making 480 kg on concrete mix. Concrete is made by mixing cement, sand and gravel in the ratio 1 : 3 : 4.

Let the amount of cement, sand and gravel is x, 3x and 4x respectively.

Since Bob the builder is making 480 kg on concrete mix, therefore

`x+3x+4x=480`

`8x=480`

Divide both sides by 8.

`x=60`

The value of x is 60.

The amount of sand is 3x.

`3x=3* 60=180`

Therefore the amount of sand builders need is 180 kg.