An elementary school class polled 198 people at a shopping center to determine how many read the Daily News and how many read the Sun Gazette. They found the following information: 171 read the Daily News, 40 read both, and 18 read neither. How many read the Sun Gazette?

Answer: 49 people

Step-by-step explanation:

First you need to separate the people that read both from the people that read the daily news. Do this by subtracting 171 - 40 = 131.

Now you can subtract the total amount of people that only read the Daily Mews from the total amount of people polled (198-131=67)

From here you need to subtract the amount of people that read neither from the remaining total. (67-18=49)

this is where you get the 49 people out of 198 that read the Sun Gazette