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SSC CHSL 9-Jan-2017 Shift 1 Paper
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© examsnet.com
Question : 52
Total: 100
Of the 5 numbers whose average is 76, the first is 3/7 times the sum of other 4. The first number is
171
114
76
228
Validate
Solution:
Sum of the five numbers = 5 × 76 = 380
Let the first number = x and Sum of other 4 numbers = y
According to ques, ⇒
x
=
3
7
y
Also, ⇒ x + y = 380
⇒
3
y
7
+
y
=
380
⇒
3
y
+
7
y
7
=
380
⇒
10
y
=
380
×
7
=
2660
⇒
y
=
2660
10
=
266
∴ The first number =
x
=
3
7
×
266
=
3
×
38
=
114
© examsnet.com
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