The average of five numbers is 20. If each number is multiplied by 2, what will be the new average?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 40
If every number is multiplied by the same number, the sum and hence the average are multiplied by it too.
Sum of the five numbers \(=5\times20=100\)
After doubling each number, the sum \(=2\times100=200\)
New average \(\displaystyle =\frac{200}{5}=40\), which is \(2\times20\)
The new average is 40.