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SSC CGL Tier 2 Exam 12 Jan 2017 Paper 1
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© examsnet.com
Question : 1
Total: 100
QUANTITATIVE ABILITIES
Twenty one times of a positive number is less than its square by 100. The value of the positive number is
25
26
42
41
Validate
Solution:
(1) Suppose, the positive number be x.
According to the question,
x
2
−
21
x
=
100
⇒
x
2
−
21
x
−
100
=
0
⇒
x
2
−
25
x
+
4
x
−
100
=
0
⇒
x
(
x
−
25
)
+
4
(
x
−
25
)
=
0
⇒
(
x
−
25
)
(
x
+
4
)
=
0
⇒
x
=
25
because
x
≠
−
4
© examsnet.com
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