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5 copii umfla5 baloane in 5 minute. Cati copii umfla 30 baloane in 15 minute?

Răspuns :

5 copii umfla 5 baloane in 5 minute =>
un copil umfla un balon in 5 minute =>
in 15 minute un copil umfla 3 baloane =>
10 copii umfla 30 de baloane in 15 minute