Question

45 is 15% of what number

Answer 1

45 = 15% of number
45 = 15% × n
15% = $\frac{15}{100}$ = 0.15

45 = 0.15n

$\frac{45}{0.15}$ = $\frac{0.15n}{0.15}$
0.15 and 0.15 cancels out

300 = n

15% of 300 is 45

45 is 155 of 300

Answer 2

15% of a number is 45
15% × x = 45
x = 45 ÷ 15%
x = 45 ÷ 15/100
x = 45 × 100/15
x = 4500/15
x = 300

Check:
15% × 300
= 15/100 × 300
= 15 × 3
= 45

45 is 15% of 300.