Respuesta :

Take that certain number we are looking for as 'n'

38% ⇒ 0.38

0.38n = 152

Divide by 0.38

0.38n = 152
 /0.38      /0.38

n = 400

So 38% of 400 is 152.
ratio and proportion
152/x=38/100
cross multiply
38x= 15200
divide by 38
x= 400

hope this helps