Question

Determine o valor da incógnita 'y' da figura abaixo? por favor com os cálculos!​

Answer 1

$\mathsf{\dfrac{4}{y}=\dfrac{12}{21}}$

$\mathsf{12y=84}\\\mathsf{y=\dfrac{84}{4}}\\\large\boxed{\boxed{\boxed{\boxed{\mathsf{y=21}}}}}$