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(1/3)*x-(1/5)*x=20
=> (2/15)*x=20 => x=150 ( suma initiala a fetelor)
150* 1/3= 50
150-50=100 Ana
150* 1/5=30
150-30=120 Ioana
120-100=20
=> Ana mai are 100 lei
Ioana mai are 120 lei