Question

solve the following equation
(ii) 15% of x = 21.​

Answer 1

$\rm{15 \% \: \: of \: \: x} = 21 \\ \\ \rm = > \: \: \: \: \frac{15x}{100} = 21 \\ \\ \rm= > \: \: \: \: \: \: x = \frac{21 \times 100}{15} \\ \\ \rm= > \: \: \: \: \: \: x = \frac{7 \times 100}{5} \\ \\ \rm= > \: \: \: \: \: \: x =7 \times 20 \\ \rm= > \: \: \: \: \: \: x =140$

Answer 2

Answer:

15 percent of x means 15x/100

which is equal to 21 it means 15x/100 = 21

cross multiplication so 21 * 100 = 2100

15x =2100

x = 2100/15 = 140 answer.

I hope it will help you