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marydqn1509owy03x
@marydqn1509owy03x
January 2021
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en 4A, sur 30 élèves il y a 40% de filles. En 4B, sur 20 élèves, il y a 60% de filles. Lorsque les deux classes sont réunis, il y a 50% de filles ? Affirmation vrai ou fausse ?
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jft80
Verified answer
En 4a : 30x40/100 = 12 filles
en 4b : 20x60/100 = 12 filles
total de filles sur les 2 classes 12+12 = 24
total d'élèves 30+20 = 50
donc 24/50 = 48
donc affirmation fausse car il y a 48% de filles
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marydqn1509owy03x
Merciii beaucoup de ton aide
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Verified answer
En 4a : 30x40/100 = 12 fillesen 4b : 20x60/100 = 12 filles
total de filles sur les 2 classes 12+12 = 24
total d'élèves 30+20 = 50
donc 24/50 = 48
donc affirmation fausse car il y a 48% de filles