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UPSC CDS Math Ratio Proportion and Variation Questions
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© examsnet.com
Question : 3
Total: 20
If a : b = c : d = 1 : 6 , then what is the value of
a
2
+
c
2
b
2
+
d
2
?
[2019 CDS-I]
1
600
1
60
1
36
1
6
Validate
Solution:
Let a = k, b = 6k. Similarly, c = k and d = 6k.
a
2
+
c
2
b
2
+
d
2
=
k
2
+
k
2
(
6
k
)
2
+
(
6
k
)
2
=
2
k
2
72
k
2
=
1
36
© examsnet.com
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