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daca denisa da cate 2 bomboane fiecarui coleg ,un copil ramane cu o singura bomboana.Daca da cate 3 bomboane fiecarui coleg ,raman 4 colegi fara bomboane
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Răspuns :

are 11 colegi si 21 de bomboane x nr colegi 2(x-1) plus 1 egal 3(x-4) 2x-1 egal 3x-12 -xegal cu -11 x egal 11 proba 2 ori (11-1) plus 1 egal 3 ori (11-4)