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UPSC CDS I 2019 Math Paper
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© examsnet.com
Question : 25
Total: 100
In a class of 100 students, the average weight is 30 kg. If the average weight of the girls is 24 kg and that of the boys is 32 kg, then what is the number of girls in the class ?
[2019 CDS-I]
25
26
27
28
Validate
Solution:
Let the number of girls be x
Then
24
x
+
32
(
100
–
x
)
=
30
×
100
⇒
8
x
=
3200
–
3000
=
200
⇒
x
=
25
© examsnet.com
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