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2cuburi+8bile=155
2cuburi+4bile=90
cat cantareste fiecare jucarie?


Răspuns :

2cuburi+8bile=154 l-
2cuburi+4bile=90
________________
   /          4 bile=154-90=64
              1 bila=64:4=16 g 
 2 cuburi...........90-4x16=90-64=26
1 cub=26:2=13 g