39
The answer is 39 ;D
It is: 39
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Half way between 36 and 42 is (36 + 42) ÷ 2 = 39.
21
29
42
The number midway between two numbers is the average of those two numbers. In this case, the average of 42 and 18 is (42 + 18) / 2 = 60 / 2 = 30. Therefore, the number midway between 42 and 18 is 30.