The average of the ages of a group of 45 men is 30 years if 5 men join

1.	The average of the ages of a group of 45 men is 30 years if 5 men join the group, the average of the ages of 50 men becomes 33 years. Then the average of the ages of those 5 men joined later (in years) is1. 55 years2. 60 years3. 65 years4. 45 years
Answer» Correct Answer - Option 2 : 60 years Given: Average of 45 men is 30 years Concept used: Average = (Total of all the variables/ No. of variables) Calculation: Total age of 45 men = 45 × 30 = 1350 years Total age of 50 men = 50 × 33 = 1650 years Total age of 5 new men = 1650 – 1350 = 300 years Average age of 5 new men = 300/5 = 60 years ∴ The average of ages of new 5 men is 60 years

The average of the ages of a group of 45 men is 30 years if 5 men join the group, the average of the ages of 50 men becomes 33 years. Then the average of the ages of those 5 men joined later (in years) is1. 55 years2. 60 years3. 65 years4. 45 years

Answer» Correct Answer - Option 2 : 60 years

Given:

Average of 45 men is 30 years

Concept used:

Average = (Total of all the variables/ No. of variables)

Calculation:

Total age of 45 men = 45 × 30 = 1350 years

Total age of 50 men = 50 × 33 = 1650 years

Total age of 5 new men = 1650 – 1350 = 300 years

Average age of 5 new men = 300/5 = 60 years

∴ The average of ages of new 5 men is 60 years

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The average of the ages of a group of 45 men is 30 years if 5 men join the group, the average of the ages of 50 men becomes 33 years. Then the average of the ages of those 5 men joined later (in years) is1. 55 years2. 60 years3. 65 years4. 45 years

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