Question

cement mortar was being prepared by mixing cement to sand in the ratio 1:6 by volume.In a cement mortar of 42 units of volume, how much more cement needs to be added to enrich the model to be ratio 2 : 9


solve it please

Answer 1

2:9
add gives 11
multiple near 42 is 44
so 44-42 = 2(ans)

Answer 2

Answer:

2

Step-by-step explanation:

Volume of cement mortar = 42 unit ( given)

Ratio of mixing cement to sand = 1 : 6

∴ The volume of cement = 42 / (1 + 6) = 42 / 7 = 6 units

the volume of sand = 6×6 = 36 units.

let x units cement need to be added to make the ratio 2:9.

⇒ (6 + x) /36 = 2 / 9

⇒ 9( 6 + x) = 72

⇒ 54 + 9x = 72

⇒ 9x = 72 – 54

⇒ 9x = 18

∴ x = 2.

Therfore, 2 units of more cement needs to be added to enrich the mortar to the ratio 2:9.