exam Maths Puzzle Numerical Ability

what is the answer for

7+3T/4= T/8

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exam Other Question

please help me in this question: the sum of the reciprocal of two consecutive integers is 17/12.find the integers A and B can do a piece of work in 42 days, B and C in 31 days and A and C in 20 days. In how many days can all of them do the work?