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AFCAT I 16 Feb 2019 Paper
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© examsnet.com
Question : 2
Total: 100
Average age of n students who promoted in class VIII is Y years. Three more students included in class whose ages are Y-l, Y-2 and Y + 3 years. Find their average age when they promoted in class Xth.
Y
Y - 3
Y + 2
Y + 5
Validate
Solution:
👈: Video Solution
(c) Total age of students who promoted in class VIII is
= n.Y years.
When 3 more students included this college.
= n .Y + Y -1 + Y -2 + Y + 3
= ny + 3y
After two years when they are in Xth total age
= n(Y + 2) + 3(Y + 2)
Avg age =
n
(
Y
+
2
)
+
3
(
Y
+
2
)
(
n
+
3
)
=
(
n
+
3
)
(
Y
+
2
)
(
n
+
3
)
= y + 2
© examsnet.com
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