Question

8.For every 15 columns of news stories in a newspaper, 4 columns of ads are required. If a newspaper contains 300 columns of news stories, how many columns of ads must it have?

Answer 1

the answer is 80

Explanation:

Basically you use proportions. So, using the 1st picture you cross multiply 4 by 300 and then do x by 15. You should end up with the equation 1200=15x.

Then solve the equation (see 2nd picture)and you get your answer as 80 column ads.