Question

21 is 75% of what number?

I don't get it.

Answer 1

21 is 75% of 28. If you use a calculator, you can just put 21×100÷75. Or if you need to do it on paper, you could do...

1. do 75/100×21

2.multiply both sides by 100 and the divide by 75

Answer 2

21=75/100x
2100=75x
X=2100/75=28