Select the number from among the given options that can replace the Question mark (?) in the following series.
80, 73, 64, 53, 40, ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 25.
80 - 7 = 73; 73 - 9 = 64; 64 - 11 = 53; 53 - 13 = 40; 40 -15 = 25