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Number System Practice Test 4
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© examsnet.com
Question : 5
Total: 40
There are four numbers A, B, C and D. Average of the first three i.e., A, B and C is 15 and that of B, C and D is 16. If the last number, i.e., D is 19, then the first number is—
15
16
17
18
Validate
Solution:
A
+
B
+
C
3
=
15
⇒
A
+
B
+
C
=
45
... (i)
B
+
C
+
D
3
=
16
⇒
B
+
C
+
D
=
48
... (ii)
∴ B + C + 19 = 48 or, B + C = 48 – 19 = 29
But, A + B + C = 45
Putting the value of B + C = 29 in the above equation (i), we get
A + 29 = 45
∴ A = 45 – 29 = 16.
© examsnet.com
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