Question

Determinati numarul natural x , stiind ca : x+1 supra 12 = 5 supra 3

Answer 1

$\frac{x+1}{12}= \frac{5}{3}$⇒x+1=12*5:3⇒x+1=60:3⇒x+1=20
⇒x=20-1⇒x=19

Answer 2

(x+1)/12=5/3

3(x+1)=12*5

3x+3=60

3x=60-3

3x=57

x=19