6. Call the length Marian bikes m. We have m/3+m=24, so 4m/3=24 and m=18, so Marian bikes 18 miles and Bin-Gee bikes the remaining 6 miles.
9. If 24 miles more than Jan's distance is three times Jan's distance, 24 is twice Jan's distance, so Jan drives 12 miles.
16. Call the amount of tied games t. We have: t+(t+1)+(t+1+2)=10, so 3t+4=10. As a result, 3t=6, so t=2. Therefore, two games were tied, 2+1=3 games were lost, and the remaining five games were won.
28. This problem is actually the same as problem 16! Do you see why? (Shortest piece is equal to games tied, middle is games lost, and largest is games won)