book Maths Puzzle Numerical Ability

A math teacher is randomly distributing 15 rulers with centimeter laables and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels?

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Please help me to simplify the following fraction:
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(x^3+2x^2y+2xy^2+y^3)(3x^2+8x-3)
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(3x^2-x+3xy-y)(x^4+3x^3-xy^3-3y^3) how do i solve questions by substitution?