Question

Dry concrete can be made by mixing sand, gravel and cement in

the ratio 1: 3: 4. If you want 1600 kg of dry concrete, how much
of each will you need? Give your answers in kilograms (kg).

Answer 1

x + 200

Explanation:

Answer 2

Given :-

Dry concrete can be made by mixing sand, gravel and cement in the ratio 1: 3: 4.

• Let, amount of sand = 1x
• gravel = 3x,
• Cement = 4x

Since If you want 1600 kg of dry concrete, then:

• 1x + 3x + 4x = 1600
• 4x + 4x = 1600
• 8x = 1600

Divide both sides by 8

• x = 200

Hence,

• amount of sand = 1x = 1*200= 200 kg
• gravel = 3x = 3*200 = 600 kg
• Cement = 4x = 4*200 = 800 kg