The number of winners of the second prize is 50*2/( 1+2+7)= 10.
The number of winners of the third prize is: 50*7/( 1+2+7)=35.
The first prize is:1700 * 6/(6 * 5+2 *10+35) =120 yuan.
The second prize is:1700 * 2/(6 * 5+2 *10+35) = 40 yuan.
The third prize is:1700/(6 * 5+2 *10+35) = 20 yuan.