Răspuns:
4cutii mandarini+6cutii portocale....180lei /×3
3cutii mandarine+4cutii portocale..125lei /×4
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12cutii mandarine+18 cutii portocale....540lei
12cutii mandarine+16cutii portocale.....500lei
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/ 2cutii portocale ........40lei
40÷2=20lei ( o cutie de portocale)
20×6=120 lei ( 6 cutii portocale )
180-120=60 lei (4 cutii mandarine )
60÷4=15lei (o cutie mandarine )