exam Maths Puzzle Numerical Ability

The tens digit of a certain number is 3 more than the units digit. The sum of the squares of the two digits is 117. Find the number.

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t+r/tr^2 + 5t+r/t^2r A REGIMENT OF SOLDIERS ,WHEN FORMED INTO A SOLID SQUARE , HAS 45 SOLDIERS FEWER IN THE FRONT THAN WHEN FORMED INTO A HOLLOW SQUARE 5 DEEP.FIND NUMBER OF SOLDIERS.