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Solution: (1) Let the sum of the two proofreaders be a. 。

If a > 200, then a = 18000 ÷ 75 = 240.

If 100 < a ≤ 200, then18000 ÷ 85 = 21and 1 1, which is irrelevant.

So the total enrollment of the two schools is equal to more than 240,200.

(2) There are X students registered in a school and Y students registered in a school, then

① When 100