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The average of 15 numbers is 7. If the average of first 8 numbers be 6.5 and the average of last 8 numbers be 9.5, then find the middle number. |
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|
a) |
23 |
b) |
20 |
c) |
40 |
d) |
50 |
|
The average of 15 numbers is 7. If the average of first 8 numbers be 6.5 and the average of last 8 numbers be 9.5, then find the middle number. |
|||||||
|
a) |
23 |
b) |
20 |
c) |
40 |
d) |
50 |