Question

Bob the builder is making 480 kg 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

Answer:

Bob the builder need 180 kg sand.

Step-by-step explanation:

The amount of concrete mixture is 480 kg. It is given that concrete is made by mixing cement, sand and gravel in the ratio 1:3:4.

Let the amount of cement, sand and gravel in concrete mixture be x, 3x, 4x respectively.

$x+3x+4x=480$

$8x=480$

Divide both sides by 8.

$x=60$

The amount of sand is 3x, so

$3\times 60=180$

Therefore bob the builder need 180 kg sand.

Answer 2

1x+3x+4x = 480

8x = 480

xdivide by 8

x=60

cement: 1x = 60kg

sand : 3x = 3*60 = 180kg

gravel : 4x = 4*60 = 240kg