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23 Mar 2026, 19:00
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Difficulty:
35%
(medium)
Question Stats:
64% (02:16) correct
36%
(02:00)
wrong
based on 50
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The average age of 100 employees of an organization in the year 2005 was 30 years. In 2007, 20 employees left at the average age of 60 years. If no employee joined or left the organization over the next five years, what was the average age, rounded to the higher side, of all employees in 2010?
A. 23 years
B. 25 years
C. 26 years
D. 28 years
E. 29 years
A. 23 years
B. 25 years
C. 26 years
D. 28 years
E. 29 years
23 Mar 2026, 22:34
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This one is trickier. Sum in 2005 = 30*100 =3000
By 2007, age of all 100 employee increases by 2 ; total sum increases by 200. Sum = 3200
In 2007, 20 employees left at an average age of 60, Sum of those who left = 20*60 = 1200
Remaining sum = 3200-1200 = 2000 ; Remaining no of employees = 100 - 20 = 80
By 2010, all remaining employee which is 80 would have had their age increased by 3 years. Sum = 3*80 = 240.
Total sum = 2000+240 = 2240 ; n = 80
Therefore avg = 2240/80 = 28 years
Option D
By 2007, age of all 100 employee increases by 2 ; total sum increases by 200. Sum = 3200
In 2007, 20 employees left at an average age of 60, Sum of those who left = 20*60 = 1200
Remaining sum = 3200-1200 = 2000 ; Remaining no of employees = 100 - 20 = 80
By 2010, all remaining employee which is 80 would have had their age increased by 3 years. Sum = 3*80 = 240.
Total sum = 2000+240 = 2240 ; n = 80
Therefore avg = 2240/80 = 28 years
Option D
24 Mar 2026, 02:08
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Total sum in 2007 = 3200
1200 worth of ages leave.
3200 - 1200 = 2000
Total ppl remain = 100-80=20
Avg = 2000/80 = 25
Avg after 3 more years = 25+3=28
Answer: Option D
1200 worth of ages leave.
3200 - 1200 = 2000
Total ppl remain = 100-80=20
Avg = 2000/80 = 25
Avg after 3 more years = 25+3=28
Answer: Option D
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