Teacher Wang and Teacher Li took several students to visit Singapore for tourism and contacted two travel companies, A and B, with the same price. After negotiation, Company A offered a favorable condition that the teacher paid the full fee, and the students paid 30% off; The preferential condition given by the company is that all teachers and students are charged at a 20% discount. After calculation, after the discount, the price of Company A is 10% cheaper than that of Company B. Q: How many students are there?
王老师和李老师带若干名学生赴新加坡旅游考察，联系了甲、乙两家标价相同的旅游公司，经洽谈后，甲公司给的优惠条件是教师付全费，学生按七折收费；乙公司给的优惠条件是全部师生都按八折收费．经计算，优惠后，甲公司的价格比乙公司便宜10%．问：学生有多少人？
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