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Another test for 7 adds five times the last digit to the rest. For 91, what is that total?

A12
B13
C15
D14
Answer & Solution
Correct answer: D. 14
1. Split 91 into 9 and the last digit 1. 2. Add five times the last digit: 9 + 5 x 1 = 14. 3. 14 is divisible by 7, which confirms 91 is too. _Source: Wikipedia, Divisibility rule, section Divisibility by 7_
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