Kanga labelled the vertices of a square-based pyramid using 1, 2, 3, 4 and 5 once each. For each face Kanga calculated the sum of the numbers on its vertices. Four of these sums equalled 7, 8, 9 and 10.
What is the sum for the fifth face?
Select one option, then click Submit.
11
12
13
14
15
Select an option, then submit.
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