Question

r$ 12 correspondem a 15% de que quantia

Answer 1

12 = 15% de x
12 = 0,15×x
x = $\frac{12}{0,15}$
x = 80

R$ 12,00 correspondem a 15% de R$ 80,00.

Answer 2

12  =   15 % . x

12 =    15   .  x
           -----
           100

12.100 = 15x
1200 = 15x
15x = 1200
x = 1200/15
x = 80

Resp.: R$ 80,00