Question

11. When lily makes concrete she uses cement, sand and gravel in the ratio 3 : 4 : 5
For one job she used 40kg of gravel.
a) How much cement and sand did she use?
b) What is the total mass of the concrete she made?

Answer 1

Answer:

a) amt of cement = 32kg

b) total mass of concrete = 96kg

Step-by-step explanation:

Cement (C), Sand (S), Gravel (G)

C:S:G = 3:4:5 = 3x:4x:5x

Amount of gravel she used = 40kg

5x = 40kg

x = 40/5 = 8kg

a) Amount of cement she used = 3x = 3*8 = 24kg//

b) Total mass of concrete = amt of Cement + amt of sand + amt of gravel

   Amount of sand = 4x = 4*8 = 32 kg

   Total mass of concrete = 24 + 32 + 40 = 96kg//

HOPE IT HELPS :)

MARK AS BRAINLIEST