Last Saturday, 215 people saw movie x, 25 people saw movie w, and 15 people saw both movie x and w. Neither of the 200 people saw z movie. How many people saw one movie on Saturday.
Please show the problem step by step to get the answer. I added 215 + 25 + 15 to get 255. Then 255-200 to get 55. Is this correct?
If you just add up x and w, you count twice all those who saw both.
So, let's say b people saw both.
That means the total people who saw either x or w or both is
215 + 25 - 15 = 225
200 saw only x
10 saw only w
15 saw both
No idea what z movie is, or who "Neither of the 200 people" are. Maybe you can resolve these issues yourself.
To find out how many people saw only one movie on Saturday, you need to subtract the number of people who saw both movies from the total number of people who saw the two movies separately.
Step 1: Add the number of people who saw movie x (215) and the number of people who saw movie w (25) to get the total number of people who saw at least one of the two movies: 215 + 25 = 240.
Step 2: Subtract the number of people who saw both movie x and w (15) from the total number of people who saw at least one of the two movies: 240 - 15 = 225.
The answer is 225. So, 225 people saw only one movie on Saturday, either movie x or movie w.
Your calculation was close, but there was a small mistake. You should subtract 15 from 240, not 200, since 15 people saw both movies, not 200.