Răspuns :
Notăm:
al - alex
io - ioana
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al+io=120
al=60/100x io
al=3/5io
al=45
io=75
3/5io+io=120
3io+5io=5x120=8io=600
io=600/8=75lei
al=3/5x85=45 lei [ alex ]
a+i =120 ; a =60 i/100 =3 i /5
3 i/5 + i =120 numitor 5
3 i+5 i =600
8 i =600
i =75 lei
a =3 i /5 =3*75 /5 =45 lei
