Bite-sized brain teaser to solve in a minute or less.
The Average Age
Category: Light Math
The average age of a group of 4 friends is 20.
A fifth friend joins the group.
The new average age is 22.
How old is the fifth friend?
A) 28
B) 30
C) 32
Solution
|
Original total: 4 × 20 = 80 New total: 5 × 22 = 110 Fifth friend's age: 110 − 80 = 30 Answer: B) 30 |
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