exam Maths Puzzle Numerical Ability

He there im stuck on a problem I cant figure out.

Simplify by removing a factor equal to 1

8y^5 z^3 /
4y^9 z^4

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exam Other Question

if the moon 202 x 10 to the 5th power miles away and the rocket travels 5.5 x 10 to the 3rd power mph, how long would this trip take? The first of the three numbers exceeds the third by one-half of the second. The sum of the second and te third numbers is one more than the first. If the second is subtracted from