exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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. I need help with truth tables. See question below. The symbol -> is an arrow for if...then.

Construct a truth table for (~q^p)->~q