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?

Question

asked Mar 18, 2020 214k views

2 Answers

Bocajim · Answer 1 · 2020-03-24T19:55:23+0000

Answer:

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.