Răspunsuri

2014-02-14T13:23:20+02:00
F-6=0,2×M 
F=1/5×M+6    |×5
5×F=M+30
M=5×F-30

F+9=0,5×M
F=1/2×M-9     |×2
2×F=M-18
M=2×F+18

5×F-30=2×F+18
3×F=48
F=16 (fata are 16 ani)

M=5×16-30=80-30
M=50 (mama are 50 ani)
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