The number of participants is a multiple of 105. Then the number of participants is one of 2 100, 2205, 23 10, 24 15, 2520, 2625, 2730, 2835, 2940.
( 1)
The winning proportion in Guangming District is 1*24+0 = 1=72.
The winning proportion in the central area is 2* 16 = 1=56.
The number of winners in Chaoyang District accounts for1*18 =1= 90+0.
The least common multiple of 72, 56 and 90 is 2520, and the number of participants should be a multiple of 2520.
(2)
Based on (1) and (2), the number of participants is 2520.
The number of winners in the first three districts is 2520 * (1* 561* 901) =108, which is 6/7 of the total number of winners, so the number of winners is108/6/7 =/kloc-.
The number of participants was 2520, and the number of winners was 126.