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Question

Which number has to be added as the last digit of 2257_ to make it divisible by 9?

A
2
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B
5
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C
9
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D
7
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Solution

The correct option is A 2
A number is said to be divisible by 9 if the sum of all its digits is divisible by 9.
Sum of the digits of the given number
= 2 + 2 + 5 + 7
= 16
16 is not divisible by 9, but we know 18 is divisible by 9 and comes after 16.
So we can add 2 to 16 to make the number divisible by 9.
So the number required = 22572

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