27 December 2013: NUMBER TRAIL

Especially for the day after Boxing Day, here’s the longest NUMBER TRAIL question we’ve ever done – containing 27 steps! Without using anything other than your brain, can you arrive at the final answer in your head? As a tradition, the last step always utilises the number seven.

You have been given a starting number of 27. Carry out the following 27 calculations to achieve the end answer. Will you have the stamina to get it right? Here we go:

Start at 27, then . . . . . . . one-third of this . . . +39 . . . 25% of this . . . +16 . . . ÷7 . . . x6 . . . -15 . . . +46 . . . ÷5 . . . x10 . . . subtract 10 . . . one-tenth of this . . . add twenty-seven . . . subtract one . . . ÷3 . . . -3 . . . x4 . . . 1/2 of this . . . +3 . . . ÷7 . . . add one hundred and thirty-eight . . . -1 . . . ÷7 . . . subtract eleven . . . +3 . . . divide by two . . . plus seven    =    ?

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2 Responses to 27 December 2013: NUMBER TRAIL

  1. awizzbang says:

    Answer is 13

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