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There are 18 numbers with 2 digits that are divisible by 5.

First 2 digit number is 10 → 10 ÷ 5 = 2 → first 2 digit number divisible by 25 is 5 × 2

Last 2 digit number is 99 → 99 ÷ 5 = 19 4/5 → last 2 digit number divisible by 5 is 5 × 19

→ There are 19 - 2 + 1 = 18 numbers with 2 digit divisible by 5.

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Q: How many 2 digit numbers are divisible by 5?
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How many 2 digit numbers are divisible by 7?

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