Question

10) Determine o valor de x nas proporções abaixo:
a) 2=8
5 x

b) 3=5
6 x​

Answer 1

$\sf{A)\,x=20}$

$\sf{B)\,x=10}$

Explicação passo-a-passo:

$\large\boxed{\begin{array}{l} \sf \dfrac{2}{5} = \dfrac{8}{x} \\ \\ \sf \: 2x = 8 \times 5 \\ \\ \sf \: 2x = 40 \\ \\ \sf \: x = \dfrac{40}{2} \\ \\ \boxed{ \boxed{ \boxed{ \sf{x = 20}}}}\end{array}}\large\boxed{\begin{array}{l} \sf\dfrac{3}{6} = \dfrac{5}{x} \\ \\ \sf \: 3x = 6 \times 5 \\ \\ \sf \: 3x = 30 \\ \\ \sf \: x = \dfrac{30}{3} \\ \\ \boxed{ \boxed{ \boxed{ \sf{x = 10}}}}\end{array}}$