The integer 36 is divisible by its units digit. The integer 38 is not. How many integers between 20 and 30 are divisible by their units digit?
A. 2
B. 3
C. 4
D. 5
E. 6
C. 4
Note that 21 is divisible by 1, 22 is divisible by 2, 24 is divisible by 4 and 25 is divisible by 5. However, 23 , 26, 27, 28 and 29 are not divisible by 3, 6, 7, 8 and 9 respectively. Therefore there are four integers between 20 and 30 that are divisible by their units digit
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