1.

1). 22 years2). 29 years3). 30 years4). 34 years

Answer»

The increase in total age = 8 × 3 = 24 YEARS

If two people whose ages are 21 and 23 years are removed, then they have to replace by 2 men whose ages have a total sum of 21 + 23 + 24 years.

Total ages of two NEW men = 68 years

$(Average = \frac{{Sum\;of\;all\;observations}}{{Number\;of\;observations}})$

∴ Average ages of two new men = 68/2 = 34 years



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