bjr
480 jeunes = 96 pupilles + 312 benjamins + n minimes
=> nbre de minimes = 480 - 96 - 312 = 72
en %age :
72 minimes ............ 480 jeunes
n minimes ............. 100
=> n = 72 x 100 : 480 = 15%
ou
96 pupilles = 96/480 x 100 = 20%
et 312 benjamins = 312/480 x 100 = 65%
reste donc 100% - 20% - 65% = 15%
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bjr
480 jeunes = 96 pupilles + 312 benjamins + n minimes
=> nbre de minimes = 480 - 96 - 312 = 72
en %age :
72 minimes ............ 480 jeunes
n minimes ............. 100
=> n = 72 x 100 : 480 = 15%
ou
96 pupilles = 96/480 x 100 = 20%
et 312 benjamins = 312/480 x 100 = 65%
reste donc 100% - 20% - 65% = 15%