I don't quite understand this question

GRE Quant Problem Solving
1

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How to use the given condition *from starting score 81 to ending score 82 *?

2

It is not 81 to 82, but s1 to s2

3

Ahhh, sheise. Lol. My bad.

4

Hint: what if you have a student with score 200 that wants to get 800?