Question

o valor de y na proporção 3/y = 12/20 será

Answer 1

Olá!
$\frac{3}{y} = \frac{12}{20}$
$12y = 3 \times 20 \\ 12y = 60 \\y = 60 \div 12 \\ y = 5$
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Answer 2

$\frac{3}{y} = \frac{12}{20} \\ \\ 12y = 60 \\ y = \frac{60}{12} \\ y = 5$