exam Maths Puzzle Numerical Ability

Divide.
50p^9q^5/ 10pq^2

A) 5p8q3
B) 5p9q3
C) 40p8q3
D) 40p9q3

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exam Other Question

(3/8)^-1 * (2a^3x^5)^2/(8a^-3x^-1)^-3 Add or subtract as indicated. Be sure to simply completely.

2/5w+10 minus 3/2w-4

I do not know how to get the denominators to become the same. I am begging someone for help, please!