exam Maths Puzzle Numerical Ability

Jeff is two years younger than Carrie. 12 years ago, Carrie was twice as old as Jeff. How old is Jeff now?

Thank you!:o)

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exam Other Question

Let A be the set of all composites less than 10, and B be the set of positive even integers less than 10. How many different sums of the form a + b are possible if a is in A and b is in B? how can i add to understand
5b^3-8b+2b^2 and 3b^2-7b^3+5b