book Maths Puzzle Numerical Ability

The sum of two numbers is 28. Their difference is 4. What are the two numbers?
thanks so much for the help!

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You are working on a new temperature scale that will unify the earth. Let F denote the temperature in degrees Fahrenheit, and let X denote your new temperature scale. You want it I hope this works. I've tried dozens, adn all of them say its simple but dont give me an explanation, A SIMPLE ONE. I would like to know what is the method to solve an equation wh