Discussion
How many such numbers are there between 1 and 100, each of which is not only completely divisible by 4 but also contains 4 as a digit ?
Answer: A
There are 7 such numbers.
List the multiples of 4 between 1 and 100 and keep those with a digit 4:
4, 24, 40, 44, 48, 64, 84
Numbers with a digit 4 such as 14, 34, 54 or 94, and 41, 42, 43, 45, 46, 47 and 49 in the forties, are not multiples of 4, so they do not count. The count is 7. Answers of 20 or 21 come from counting every number with a digit 4 (there are 19 between 1 and 100) or every multiple of 4 (25), without requiring both conditions.
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