simran amp raj are playing a game simran writes down all the natural numbers from 1 to 100 then raj ...........

Logical Reasoning(Master ) Arithmetical Reasoning

simran & raj are playing a game, simran writes down all the natural numbers from 1 to 100, then raj has to calculate how many times does she write four?

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Explanation:

From 1 to 100, there are exactly 10 numbers with 4 as their tens digit – 40, 41, 42 ,43 ,44, 45,46,47,48,49 ; and 10 numbers with 4 as their unit digit: 4,14,24,34,44, 54,64,74,84,94
So, the required number of numbers = 10 + 10 = 20