00:12 – Challenging Word Problem #1
05:34 – Challenging Word Problem #1 (alternate solution)
09:26 – Challenging Word Problem #2
12:15 – Challenging Word Problem #3
16:06 – Challenging Word Problem #4
22:53 – Challenging Word Problem #5
25:11 – Challenging Word Problem #6
27:47 – Challenging Word Problem #7
30:06 – Challenging Word Problem #8
33:30 – Challenging Word Problem #9
36:16 – Challenging Word Problem #10