in a class there are 55 pupil , out of them 10 are in debate only and 18 in singing only . then how many in both ?
explanation : total pupil = 55 debate + singing = 10 + 18 = 28 the intersection for two = 55 â € “ 10 â € “ 28 = 17 play both games . answer : c
subtract(subtract(subtract(55, 18), 10), 10)