The average of five numbers is 27. If the number 35 is removed from the set, what is the average of the remaining four?

Explanation

1. 01

   An average question is usually a total question in disguise, so recover the total first.

2. 02

   The five numbers add up to $5 \times 27 = 135$.

3. 03

   Removing 35 leaves $135 - 35 = 100$ spread across four numbers.

4. 04

   The new average is $100 \div 4 = 25$.