Solve (1/2)(a+1)=(1/6)(a-1). Here 1/2 is multiplied to (a+1)and 1/6 is multiplied to (a-1)

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Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?