Arithmetic

Central Tendency

Medium

The average age of group of 5 friends is 32 years. The youngest friend amongst them is 4 years old. What was the average age of the group at the time of birth of the youngest friend?

36 years

35 years

34 years

33 years

✅ Correct Option: 2

Total age now = 5 x 32 = 160 years. Four years ago each of the older 4 friends was 4 years younger, so their combined age was 160 - 5 x 4 = 140. At that moment only the 4 older friends existed in age, so their average = 140/4 = 35 years.

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The average age of group of 5 friends is 32 years. The youngest friend amongst them is 4 years old. What was the average age of the group at the time of birth of the youngest friend?

Solution

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