exam Maths Puzzle Numerical Ability

The volume of a solid bar is equal to the product of the cross-sectional area and the length of the bar.

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Please help me!The problem is:
An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?
Please and Thank you=) What is the GCF of the polynomial equation 9b+5c?