Răspuns:
notam cu x suma initiala
3x/5 - a cheltuit prima data
⁵⁾x-3x/5=(5x-3x)/5=2x/5 - rest
2x/5·2/4=2x/5·1/2=x/5 +12 - a cheltuit a2a oara
3x/5+x/5+⁵⁾12+⁵⁾14=⁵⁾x
3x+x+60+70=5x
130=5x-4x
x=130 lei suma initiala
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verificare:
3·130:5=78 lei a cheltuit prima data
130-78=52 lei rest
130:5+12=26+12=38 lei a cheltuit a doua oara
78+38+14=130 lei
