exam Maths Puzzle Numerical Ability

3(d-4)+2=2d+1-d

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the second and third terms of a sequence are 79 and 92. if the first differences are constant,then find the first 5 terms of the sequence. One inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. How long will it take the pipe to fill the pool if the drain is left open?