Question

determina numărul natural n care verifica egalitatea n/n+3 =0,8 (63)

Answer 1

$\frac{n}{n + 3} = 0.8(63) \\ \frac{n}{n + 3} = \frac{19}{22} \\ 22n = 19(n + 3) \\ 22n = 19n + 57 \\ 22n - 19n = 57 \\ 3n = 57 \\ n = 19$