Question

Considere que 2/5 de 3/4 de um número são 108. Calcule esse número?

Answer 1

2/5 . 3/4 * x = 108 

6/20 * x = 108 

108 * 20 = 6x 
x = 2160 / 6 

x = 360 

Answer 2

$Seja\ x\ esse\ n\'umero\\\\ \dfrac{2}{5}\cdot \dfrac{3}{4}\cdot{x}=108\\\\\\ \dfrac{6}{20}\cdot{x}=108\\\\\\6x=20\cdot108\\6x=2160\\\\\\x= \dfrac{2160}{6}\\\\\\\boxed{x=360}$