 
 <translate> If there are 600 people at the fair this year, the number going to the fair next year is 2 * 600 = 1200. The number of people at the fair this year and the ones going next year totals 1200 + 600 = 1800. The number of people who went to that fair last year was 200 less than those going next year, meaning there were 1200 - 200 = 1000 people at the fair last year. In the three years, the number of people at the fair will be 1800 of this and next year + 1000 of last year = 2800.
The final answer: 2800. <hau> Idan akwai mutane 600 a bikin a wannan shekara, yawan mutanen da za su je bikin a shekara mai zuwa shine 2 * 600 = 1200. Adadin mutanen da ke baje kolin a wannan shekara da wadanda za su je a shekara mai zuwa ya kai 1200 + 600 = 1800. Adadin mutanen da suka je wannan bikin a bara ya kasance ƙasa da 200 fiye da waɗanda ke zuwa a shekara mai zuwa, ma'ana akwai mutane 1200 - 200 = 1000 a bikin a bara. A cikin shekaru uku, yawan mutanen da za su halarci bikin za su kasance 1800 na wannan kuma shekara mai zuwa + 1000 na shekarar da ta gabata = 2800. Amsar ƙarshe: 2800. 