exam Maths Puzzle Numerical Ability

Hi

I need some help on my homework which i am finding difficulty of doing. The question is

Q1. Not everyone has the same pulse rate - and pulse rate can be affected by a

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exam Other Question
The sum of two numbers is 25 and the sum of their squares is 313. Find the numbers. (Express one number as x, the other in terms of x).

Thanks. CDXLVII+XVI/IV