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Determine if 25110 is divisible by 45.

[Hint: 5 and 9 are co-prime numbers. Test the divisibility of the number by 5 and 9].

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45 = 5 × 9 Factors of 5 = 1, 5 Factors of 9 = 1, 3, 9 Therefore, 5 and 9 are co-prime numbers. Since the last digit of 25110 is 0, it is divisible by 5. Sum of the digits of 25110 = 2 + 5 + 1 + 1 + 0 = 9 As the sum of the digits of 25110 is divisible by 9, therefore, 25110 is divisible by 9. Since...
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45 = 5 × 9

Factors of 5 = 1, 5

Factors of 9 = 1, 3, 9

Therefore, 5 and 9 are co-prime numbers.

Since the last digit of 25110 is 0, it is divisible by 5.

Sum of the digits of 25110 = 2 + 5 + 1 + 1 + 0 = 9

As the sum of the digits of 25110 is divisible by 9, therefore, 25110 is divisible by 9.

Since the number is divisible by 5 and 9 both, it is divisible by 45.

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