exam Maths Puzzle Numerical Ability

The Computer Club invested $2200, part at 4.5% interest and the rest at 7%. The total annual interest earned was $144. How much was invested at each rate?
How do I set up this problem?

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exam Other Question

Why is the product of two numbers not always their least common multiple? Can you please help me with this? I have no idea how to work these.

(3x squared - 7x + 5)+(-2x squared + 7x - 8)

(5y squared - 3y + 4)-(3y squared - 7y + 2)