exam Maths Puzzle Numerical Ability

What precent of 120 is 15?

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Word Problem:

Given that 2.54 centimeters (cm)= 1 inch, 12 inches (in) = 1 foot (ft), and there are 5280 ft = 1 mile, how many centimeters are there in one mile?
please help to multiply

(2x + 4)(3x^2 - 2x - 10)