Others Maths Puzzle Numerical Ability Number System

In T. Nagar the building were numbered from 1 to 100. Then how many 4‟s will be present in the numbers?

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Others Other Question
There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a new comer. If the average of the class was thereby lowered by 1 month, the age of new comer is Wht is the largest power of 10! That can divide 100!