Ответ учителя по предмету Математика
Полагается решать через систему из двух уравнений.
1) А = В-5
2) А*108% = 90%*В
1,08*(В-5) = 0,9*В — можно и с этого уравнения начать.
0,18*В = 5,4
В = 5,4 : 0,18 = 30 чел — ответ
А = В — 5 = 25 чел — ответ
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