Question

Determinati nr nat n stiind ca n+1/12 = 5/3

Answer 1

n+1=(12x5):3
n+1=60:3
n+1=20
n=19

Answer 2

(n+1)/12 = 5/3
3×(n+1) = 5×12
3n+3 = 60
3n = 60-3
3n = 57
n = 57 :3
n = 19