Posted by Alex on .
I'm not sure how to solve this: A group of friends went to an amusement park. 10 of them rode the ferris wheel, 15 rode carousel, and 11 rode the roller coaster. 7 of them rode both the ferris wheel & roller coaster. 4 rode both the ferris wheel & carousel. 5 rode both the carousel and roller coaster. 3 rode all three rides. HOw many friends went to the park?
work:
Ferris wheel & roller coaster 72 = 5
Ferris wheel & carousel 42 = 2
carousel & roller 53 = 2
carousel, ferris wheel, & coaster = 3
5 + 2 +2 +3 = 12 people?

5th grade math (word problems) 
Reiny,
These are best done by using Venn diagrams
(google 'Venn diagram' to get a better idea of that)
Here is a nice short youtube video of a problem that resembles yours, and explains it step by step.
http://www.youtube.com/watch?v=MassxXy8iko
draw the 3 circles within the rectangles and follow the steps outlined in the video
you should get 23 going to the park
let me know if you need further help 
5th grade math (word problems) 
Alex,
Thanks!!