3Б=m, 3А=n
Б=m/3, A=n/3
Б-А = m/3 - n/3 = 18/3 - 15/3 = 6 - 5 = на 1 рубль дороже
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3Б=m, 3А=n
Б=m/3, A=n/3
Б-А = m/3 - n/3 = 18/3 - 15/3 = 6 - 5 = на 1 рубль дороже