exam Maths Puzzle Numerical Ability

I am trying to simplify the following:
(x^2)^5 * x / x^3

I got to this:
x^2.5 / x^3 * x / x^3 = x^10 / x^3 * x / x^3

Now I am stumped.

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exam Other Question

there were 3/4 as many women as there men in a train yesterday. at the next station, 12 women and 6 men got in. as a result, there were 6/7 as many women as men on the train. how many men and women were in the train at first? What is the GCF for the polynomial 8x^4y + 6x^2y^2?