Question

15% of 80 is 60% of what number?

Answer 1

the unknown number is 20

Explanation:

15% of 80 = 15% × 80

= 0.15 × 80

= 12

60% of a number

let the number = y

60% of y = 60% ×y

= 0.6 ×y

= 0.6y

15% of 80 = 60% of the number

12 = 0.6y

divide both sides by 0.6:

$\begin{gathered} \frac{0.6y}{0.6}\text{ = }\frac{12}{0.6} \\ y\text{ = 20} \end{gathered}$

Hence, the unknown number is 20