A new teen magazine has a readership goal of 3.5 million. It's current readership is 2.8 million. How much does its readership need to increase to meet the goal?
subtract 2.8 million from 3.5 million and then thats your answer
3,500,000 - 2,800,000 = 700,000
So the magazine needs 700,000 readers to meet their goal.
Hope that helps you. :-)