Question 252233
Ann, Bob, Cal, and Don all worked out on the treadmill. Their times (in no particular order) were 16, 18, 23, and 25 minutes. Cal worked out two minutes more than Bob. Don worked out fewer minutes than Ann but more minutes than Cal.
Who worked out 25 minutes? 
<pre><font size = 4 color = "indigo"><b>
Let each person's initial stand for the number of 
minutes that person worked out.

C = B + 2
D < A
D > C

The only possibilities for C = B+2 are:

A=16, B=23, C=25, D=18, doesn't work because D not < A
A=18, B=23, C=25, D=16, doesn't work because D not > C
A=23, B=16, C=18, D=25, doesn't work because D not < A
A=25, B=16, C=18, D=23, works!

So,
Ann worked out 25 minutes,            
Bob worked out 16 minutes,
Cal worked out 18 minutes,
Don worked out 23 minutes.

Edwin</pre>