Q: James takes 20 units per semester at community college. If each unit costs $50 how much does he pay for 2 semesters?
A: He pays 20 * 50 = $1000 per semester. So he pays 1000 * 2 = $2000. The answer is 2000.

Q: James buys 200 lotto tickets for 2 dollars each. Of those tickets 20% are winners. 80% of the winners are for 5 dollars. 1 ticket is the grand prize of $5,000. The other tickets win an average of $10. How much did he profit?
A: He spent 200 * 2 = $400. There were 200 * .2 = 40 tickets. Of those 40 * .8 = 32 are 5 dollar winners. So they win 32 * 5 = $160. He has 40 - 32 = 8 other winning tickets. Of those 8 - 1 = 7 wins $10. So they win 10 * 7 = $70. So he won 5000 + 70 + 160 - 400 = $4830. The answer is 4830.

Q: It took an alligator named Paul 4 hours to walk from his home at the River Nile to the Nile Delta. On the return journey, Paul traveled with six other alligators, the journey taking 2 more hours than Paul took to walk to the Nile Delta, to reach their home at the River Nile. What's the combined time the alligators walked?
A:
If on the return journey to its home, the alligator took 2 more hours than it took to travel to the Nile Delta, Paul took 4 + 2 = 6 hours to travel back to its home. The total time Paul took to travel from its home to the Nile Delta and back is 6 + 4 = 10. On his return journey, Paul traveled with six other alligators, and since each alligator traveled for six hours up the Nile to their home, they took a total of 6 * 6 = 36 hours to do so. Together with Paul, all the alligators took 10 + 36 = 46 hours traveling between Nile Delta and up the Nile. The answer is 46.