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RBI Grade B Officers 2011 dec Paper
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© examsiri.com
Question :
120 of 200
Marks:
+1
,
-0
I
.
(
x
+
y
)
3
=
1331
I
I
.
x
–
y
+
z
=
0
I
I
I
.
x
y
=
28
x < y = z
x
<
y < z
x < y > z
x = y > z
x = y = z or if none ofthe above relationshipis established
Validate
Solution:
(5)
I
.
(
x
+
y
)
3
=
1331
⇒
x
+
y
=
11
⇒
y
=
11
–
x
From equation III,
x
(
11
–
x
)
=
28
⇒
11
x
–
x
2
=
28
⇒
x
2
–
11
x
+
28
=
0
⇒
x
2
–
7
x
–
4
x
+
28
=
0
⇒
x
(
x
–
7
)
–
4
(
x
–
7
)
=
0
⇒
(
x
–
7
)
(
x
–
4
)
=
0
⇒
x
=
7
,
4
From equation I
y = 4, 7
From equation II
7
–
4
+
z
=
0
⇒
z
=
–
3
4
–
7
+
z
=
0
⇒
z
=
3
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