Anna, ivan and elena are running for class president. on thursday night anna had 20% of the votes, ivan had 35% of the votes and elena had 45% of the votes. on friday, final votes were added to the counts and all of them favored elena. if in the end anna had 16% of all votes, what percent of the voters chose ivan?

28%

Step-by-step explanation:

On Thursday night Anna had 20% of the votes, Ivan had 35% of the votes and Elena had 45% of the votes. You can take the number of total votes on Thursday equal to 100, then Anna had 20 votes, Ivan had 35 votes and Elena had 45 votes.

Let x be the number of votes added on Friday. All of them favored Elena, then Elena in total had 45+x votes and the number of all votes became 100+x. In the end Anna had 16%, then

100+x - 100%,

20 - 16%.

Write a proportion:

Find the percent of the voters that chose Ivan:

125 - 100%,

35 - y%.

Write a proportion:

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

step-by-step explanation: