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Yet again, easy when you know…if a bit tedious…. You weigh every single packet and record the results. The smallest difference between any 2 results equates to the smallest difference possible in the number of sheets, i.e. one – a single sheet. Therefore the smallest difference between two weighings equals the weight of one sheet of paper – result! Remember though, this only works if you if you have a large enough sample of packets that you can be fairly sure that you’ll have packets with consecutive number totals – and like I said, we had a HUGE number of packets. You could do extra checks by checking if your answer is a factor of all the other weighings. If it’s not then you might have to do a bit more calculating that we aren’t going to go into here as we have better things to do and, as I said, we had a HUGE number of packets. Have a great summer.