Question

If four bags of cement are needed to make 1 cubic metre of concrete, then bags are needed to make 5 cubic metres of concrete.

• A. 25
• B. 20
• C. 30

Answer 1

The correct option is B 20

Given, 4 bags of cement are needed to make 1 cubic metre of concrete.

The number of bags of cement(A) needed increases with the area of concreate(B) needed to be made. Hence, they are directly proportional.

$So,\frac{A_1}{B_1}=\frac{A_2}{B_2}$

$\Rightarrow \frac{4}{1}=\frac{A_2}{5}$

$\Rightarrow A_2=20$