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RRB Junior Engineer Stage 1 Model Papers 6
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© examsnet.com
Question : 5
Total: 99
If
5
a
+
1
2
a
=
5
,the value of
9
a
2
+
1
25
a
2
is
34
5
39
5
42
5
52
5
Validate
Solution:
5
a
+
1
3
a
=
5
On multiplying by
3
5
,
3
a
+
1
5
a
=
5
×
3
5
=
3
On squaring,
9
a
2
+
1
25
a
2
+
2
×
3
a
×
1
5
a
=
9
⇒
9
a
2
+
1
25
a
2
=
9
−
6
5
=
45
−
6
5
=
39
5
© examsnet.com
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