Question 1198451
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This is unsolvable because there is a contradiction.
This:</pre>Only 4 walked and caught the jitney<pre>contradicts this:</pre>10 did all three<pre>
If 10 did all three, then that means they did two.  So those 10 would have had to
walk and to catch the jitney.  But the first statement says only 4 did.  So there
must be a typo here.  If you want to see a problem exactly like yours, go here:

http://www.algebra.com/tutors/students/your-answer.mpl?question=288071

Edwin</pre>