Question

calcule o valor de x nas proporções: 4/5=20/x+1

Answer 1

$\frac{4}{5} = \frac{20}{x + 1} \\ 4 \times (x + 1) = 5 \times 20 \\ 4x + 4 = 100 \\ 4x = 100 - 4 \\ 4x = 96 \\ x = \frac{96}{4} \\ x = 24$