Question

Determinati numarul natural "n" astfel incat urmatoarele fractii sa fie egale cu fractia 5/6 (5 supra 6)
1. n+1/18
2. 30/2n+4
3. 105/10n+6

Answer 1

(n+1)/18=5/6
(n+1)/18=15/18
n+1=15
n=14

30/(2n+4)=5/6
30/(2n+4)=30/36
2n+4=36
2n=32
n=16

 105/(10n+6)=5/6
 105/(10n+6)=105/126
10n+6=126
10n=120
n=12