Răspuns :
1/2 × I = 1/3 × C = 2/5 × M
C = I + 8
I/2 = C/3 |×6
3I = 2C
3I = 2I + 16
3I - 2I = 16
I = 16 ani
C = 16 + 8
C = 24 ani
1/2 × 16 = 1/3 × 24 = 2/5 × M
8 = 8 = 2/5 × M
2M/5 = 8 ani
2M = 8×5
2M = 40 ani
M = 40:2
M = 20 ani
C = I + 8
I/2 = C/3 |×6
3I = 2C
3I = 2I + 16
3I - 2I = 16
I = 16 ani
C = 16 + 8
C = 24 ani
1/2 × 16 = 1/3 × 24 = 2/5 × M
8 = 8 = 2/5 × M
2M/5 = 8 ani
2M = 8×5
2M = 40 ani
M = 40:2
M = 20 ani