There were 3 candidates A, B, and C in a school election for the President of Student Council. There were 1120 voters and the votes for the 3 candidates were divided in the ratio of 11 : 7 : 2. Calculate the difference between the highest number and lowest number of votes. Answer ...

1. Find the value of one ratio part.

Total ratio parts:
$11+7+2=20$
Each part represents
$1120\div 20=56$ votes.

2. Find the difference between the highest and lowest number of votes.

Highest ratio part $=11$, lowest ratio part $=2$.

Difference in ratio parts:
$11-2=9$
Difference in votes:
$9\times 56=504$