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Delhi Police Constable Exam Model Paper 9
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© examsnet.com
Question : 78
Total: 100
Sum of square of two numbers is 74 and their product is 35, then the sum of both will be
15
12
25
20
Validate
Solution:
Tips & Tricks
Given:
Sum of square of two numbers = 74
Product of two number = 35
Formula:
(
a
+
b
)
2
=
a
2
+
b
2
+
2
a
b
Calculation:
(
a
+
b
)
2
=
74
+
2
×
35
⇒
(
a
+
b
)
2
=
74
+
70
⇒
(
a
+
b
)
2
=
144
⇒
a
+
b
=
√
144
⇒
a
+
b
=
12
Sum of square of two numbers is 12.
© examsnet.com
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