exam Maths Puzzle Numerical Ability

This is actually an rational expression which I am sure it is a difference but here it is.

Simplify--

2r^2+3r-20s^2 from 4r^2-25s^2.

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exam Other Question
a softball player had 13 hits in 25 times at bat.what percent of her times at bat resulted in hits? 1. r-9/4
2. 6/19x