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Question
Add the three numbers on each of these lines. What do you notice?
5 + 13 + 21 =
6 + 13 + 20 =
7 + 13 + 19 =
12 + 13 + 14 =
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Solution
5 + 13 + 21 = 39
6 + 13 +20 = 39
7 + 13 + 19 = 39
12 + 13 + 14 = 39
On adding these numbers, it is noticed that the total of each such line is the same.
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