book Maths Puzzle Numerical Ability

If 40rpm = 29kg How many rpm = 40 kgs

gven 29 kgs = 40 rpm therefore
1 kg = 40 divided by 29 = 40/29
40 kgs = 40/29 multiplied by 40 = 1600/29 = 55.17 kgs

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book Other Question

(8x+2y)-(5x+4y)= I am having difficulty solving the following problem. The instructions are
Factor the polynomial completely
3x^2 + 6x + 3

Thank you