Question

# 32 is 40 percent of what number?A. 12.8B. 128C. 80D. 800

Hint: Assume the required number to be an unknown quantity x. Now, formulate an equation on the basis of the given condition. Then solve for the unknown quantity from the obtained equation.

$\dfrac{40}{100}\cdot x\text{ = 32 }....\text{(i)}$
\begin{align} & \dfrac{40}{100}\cdot x\text{ = 32} \\ & \Rightarrow \text{ }x\text{ = 32 x }\dfrac{100}{40} \\ & \therefore \text{ }x\text{ = }\dfrac{32\text{ x 10}}{4}\text{ = 8 x 10} \\ & \text{ = 80} \\ \end{align}
$\dfrac{40}{100}\text{ x 32 = 4 x 3}\text{.2 = 12}\text{.8 }$