The table below shows numbers from 1 to 56. Kai and Ray are given a plastic frame that covers exactly 9 squares of the table with the centre square covered.

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Worked solution

1. Calculate the sum of the 8 visible numbers

$\text{Sum} = 29 + 30 + 31 + 37 + 39 + 45 + 46 + 47 = 304$

2. Calculate the average of the 8 numbers

$\text{Average} = \frac{304}{8} = 38$

(Alternatively, by symmetry, the average of the 8 surrounding numbers is equal to the centre number, which is $38$ .)

Answer

$38$

AI analysis — may contain mistakes.

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