Question: If 1+4=5, 2+5=12, and 3+6=21, how much is 5+8?

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Ans: 45

Explanation:

The logic used : Here we add the Answer of the first step to the given sum of the other two numbers.

5 + 2 + 5 = 12

12 + 3 + 6 = 21

21+4+7=32

32 + 5 + 8 = 45