Respuesta :
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
1. do 75/100×21
2.multiply both sides by 100 and the divide by 75