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In 5 cutii sunt 40 de mingi de ping-pong.Cate mingii sunt in 7 cutii?

Răspuns :

5cutii...........40 de mingi
7 cutii............x mingi
x×5=7×40
5x = 280
x= 280÷5
x= 56 mingi
40 : 5 = 8 mingi de ping pong sunt intr-o cutie 

8 x 7 = 56 mingi de ping pong sunt in 7 cutii 

sau : 

40 mingi ...............  5 cutii 
x mingi ..................  7 cutii 

x = 40 : 5 x 7 = 8 x 7 = 56 mingi