Question

calcula 4/9 de .... =1800

Answer 1

4/9*x=1800
x=1800/(4/9)
x=(1800*9)/4
x=4050

Answer 2

El número = x

Resolvemos : 

4/9 de x = 1800

x * 4/9 = 1800

4x/9 = 1800

4x = 1800 * 9

4x = 16200

x = 16200/4

x = 4050

Solución : Los 4/9 de 4050 es = 1800