Problems involving averages are very common on GMAT.

### Basic Formula for Average

The average of N numbers is their sum of numbers divided by N.

Average = Sum/N

**Other Variants**

- Weighted average
- Using average to find number
- Average speed

Problems involving averages are very common on GMAT.

The average of N numbers is their sum of numbers divided by N.

Average = Sum/N

**Other Variants**

- Weighted average
- Using average to find number
- Average speed