IGCSE & GCSE Maths - Upper & Lower Bounds 

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Because the subtraction rule of the upper bound and lower bound is different

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divide with 2 either way. All values should be halved and you get that by dividing it with 2.

The terminology in part c) could be seen to be rather confusing. What we are trying to find is the 'upper bound' or 'maximum' DIFFERENCE in the weights. For this difference in their weights to be maximised, I took the upper bound of Anu's weight and subtracted the lower bound of Zoe's weight.

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