Question

12/16 = y/20 qual o valor do y

Answer 1

Multiplica cruzado:

$\dfrac{12}{16} = \dfrac{y}{20} \\\\16y=240\\\\\\y= \dfrac{240}{16} \\\\\\y=15$



Forte abraço!

Answer 2

12 X y
16 20
(multiplica invertido) ficando:
16y=12x20
16y=240
y=240/16
y=15