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Average is determined by the following formula: . We can use this formula in the rearranged form . So if the average of 5 numbers is 35, then the sum of the 5 numbers is 35 x 5 = 175.
One number is removed, which means there are 4 numbers remaining. If the average of 4 numbers is 39, then the sum of the 4 numbers is 39 x 4 = 156.
Since we had a total of 175 and this has been reduced to 156, this means that the number removed is the result of subtracting 156 from 175. The number removed is 175 - 156 = 19.
Therefore the correct choice is (C).
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