<PRE><B>Question 518962</B>
If Judy runs the 100 yard track and Mary runs the 75 yard track, how many times 
will they each have to run to complete the same number of yards.
:
The least common multiple of 100 and 75
Prime factor
100: 2*2*5*5
75: 3*5*5
LCM; 2*2*3*5*5 = 300 yds,  
Judy: 300/100 = 3 laps
Mary: 300/75 = 4 laps </PRE>