repedee dau 5 stele si coroana

coroana???
5 cutii......40mingi
7 cutii.....x mingi
40mingi:5cutii=8 mingi intr o cutie
7cutii×8 mingi=56 mingi in 7 cutii
[tex]x = \frac{7 \times 40}{5} = \frac{280}{5} = 56 \: mingi[/tex]
Răspuns:
5×40=200 (mingi de ping-pong in 5 cutii)
7×40=280(mingi de ping-pong in 7 cutii)