Question

In atelierul de creatie ,copiii au confectionat fluturi ,buburuze si albine.Daca 34 nu sunt bu buburuze,26 nu sunt fluturi,iar 30 nu sunt albine,cate insecte a creat fiecare elev?

Answer 1

f+a=34
b+a=26
f+b=30
34+26+30=90
90:2=45
a+f+b=45
45-34=11 (b)
45-26=19 (f)
45-30=15 (a)