Posted by Daniel on Monday, March 7, 2011 at 3:23pm.
You need to show a Venn Diagram for this question
Have you done Venn diagrams before?
Draw two intersecting circles, call then F and R
put 8 in the intersection of F and R.
put 17-8 or 9 in the region of F not intersected.
put 23-8 or 15 in the region of R not intersected.
So counting up what we have:
9 + 8 + 15 = 32 , good!
How many are "only" in the F circle ?
The answer to the question is 25 people rode the ferris wheel
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