Question
If 2 is added to each odd digit and 1 is subtracted from
each even digit in the number 7185634, what will be the sum of the digits which are second from the left end and second from the right end in the new number thus formed?Solution
Apply the rule to each digit of 7185634:
7 → 9
1 → 3
8 → 7
5 → 7
6 → 5
3 → 5
4 → 3
New number: 9377553 Second from left = 3 ; second from right = 5 .
Sum = 3 + 5 = 8 .
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