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09 Dec 2015, 08:14
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D
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Difficulty:
5%
(low)
Question Stats:
83% (00:59) correct
17%
(00:47)
wrong
based on 172
sessions
History
Date
Time
Result
Not Attempted Yet
If the average of a, b, c, 14 and 15 is 12. What is the average value of a, b, c and 29
A. 12
B. 13
C. 14
D. 15
E. 16
A. 12
B. 13
C. 14
D. 15
E. 16
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04 Nov 2022, 08:08
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Official Solution:
If the average of \(a\), \(b\), \(c\), 14 and 15 is 12. What is the average value of \(a\), \(b\), \(c\) and 29?
A. \(12\)
B. \(13\)
C. \(14\)
D. \(15\)
E. \(16\)
The average of \(a\), \(b\), \(c\), 14 and 15 is 12 means:
\(a+b+c+14+15=5*12\);
\(a+b+c+29=60\).
We want to find the average of \(a\), \(b\), \(c\) and 29, so the value of \(\frac{a+b+c+29}{4}\).
Since from above we have that \(a+b+c+29=60\), then \(\frac{a+b+c+29}{4}=\frac{60}{4}=15\).
Answer: D
General Discussion
