Find the missing (?) in the series50, 49.5, ?, 45.5, 42, 37.5, …………….. 

Here, the difference between two numbers is 0.5, 1.5, 2.5, 3.5...and so on.

50 - 0.5 = 49.5;

49.5 - 1.5 = 48;

48 - 2.5 = 45.5;

45.5 - 3.5 = 42;

42 - 4.5 = 37.5

Hence, the correct answer is 48.