exam Maths Puzzle Numerical Ability

1.find three consecutive integers such that the sum of their squares is 77

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Write the fraction in simplest form.

18. 24/18

Any help with this equation would be GREATLY appreciated.
I need to come up on showing how to answer the square root of 74. It was from a question that started from 5 to the 2nd power + 7 to the second power which I believe is 74 so I nee