The average of ten numbers is 10.9. If 15 is the average of the initial 5 numbers, and 10 is the average of the next five numbers. Then find out the number that lies at the mid position.
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Step-by-step explanation:
the sum of first 9 numbers, again because you know the average. Let this sum be ‘B’
If you have sum of the last 9 numbers, let's call it C, then (B + C - A) will give you the middle number since this number has been added twice (once in B, and once in C) and haas been subtracted only once (in A).
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