90% Fail to Solve This Math Riddle

mathproblem_580x304

The answer is 72.

This is the logic for the equation:

Add the numbers and then multiply it by 3.

1 + 5 = (1 + 5)x3 = 6 x 3 = 18

Therefore,

4 + 20 = (4 + 20)x3 = 24 x 3 = 72

How did you do?

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