A travel agency plans to launch a "One-Day Tour to Linzhou Hongqi Canal" activity for students during the summer vacation. The charging standards are as follows:

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Solution: (1) Suppose the sum of the number of people in the two schools is a.

If a>200, then a=18000÷75=240．

If 100＜a≤200, then a=18000÷85=211 and 11/17, which does not meet the meaning of the question.

So the total number of students from these two schools who signed up for the tour is equal to 240, which is more than 200.

(2) Suppose there are X+Y=240 85X+90Y=20800

Answer: School A has 160 students who signed up for the tour, and School B has 80 students who signed up for the tour.

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