Question 980029
C=x
B=x+300
A=x+500

1% of As votes is 0.01(x+500) or 5+0.01x
B becomes (x+300)+5+0.01x
C becomes x)+10+0.02x
A has been reduced to x+500-15-0.03x

B and C
1.01x+305 -100=1.02x+10
1.01x+205=1.02x +10
195=0.01x
multiply both sides by 100
19,500=x

Initial count: 
A=20000
B=19800
C=19500
1% of A is 200 votes
2% is 400 votes
A had 19400 votes
B had 20000 votes
C had 19900 votes
That is the final result.