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If we write 1 to 100, the number of times the digit 5 has been written is
a) 11
b) 15
c) 19
d) 20
e) non of these
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Please don't tell answer only . Explain how you have chosen the answer.
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SORRY I have written the wrong answer in the main part. So I have  given my question by comment

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Clearly, From 1 to 100, there are ten numbers with 5 as the unit's digit - 5, 15, 25, 35, 45, 55, 65, 75, 85, 95 and ten numbers with 5 as the ten's digit - 50, 51, 52, 53, 54,  55, 56, 57, 58, 59.

So, required number = 10 + 10 = 20.

In 55 there are two 5's in one's digit and other in ten's digit

so we have counted 55 two times

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