I'm guessing 34, because 36 - 5 = 31 therefore 5 + 31 = 36; so 3 + 31 is 34. Which should be your answer.
Or, 36 is 6 squared, which is (5 + 1) squared. So, another possible answer is (3+1) squared, which is 16.
Or, 36 = (5 x 7) + 1. So 3 would correspond with (3 x 7) + 1 = 22.
There are other possibilities, too.
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