The sum of two number is 29 and the difference of their

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The sum of two number is 29 and the difference of their squares is 145. The difference between the number is ?

1. 13
2. 5
3. 8
4. 11

Correct Option: B

Let the number be a and b
Then, (a-b) = (a² - b²) / a+b
= 145/29
= 5