[Question]: A hot dog stand sells 10 hot dogs every hour, each one selling for $2. How many hours does the stand need to run to make $200 in sales?
[Answer]: First, we find out how much in sales the stand makes each hour by multiplying the number of hot dogs sold by the sales price, finding that 2 * 10 = 20 dollars in sales each hour. Then we divide the sales goal for the day by the sales per hour, finding that the stand needs to be open for 200 / 20 = 10 hours to hit its sales goal.
So the answer is 10.

[Question]: John has five more roommates than twice as many as Bob. If Bob has 10 roommates, how many roommates does John have?
[Answer]: Twice ten roommates is 2 * 10 = 20. John has 5 more than 20 roommates which is 20 + 5 = 25 roommates.
So the answer is 25.

[Question]: John injures his shoulder while lifting weights. After the injury, his bench press goes down 80%. After a bit of training, he manages to triple the weight he can bench. If he started with a 500-pound bench press, what is it now?
[Answer]:
He lost 500 * .8 = 400 pounds from his bench. So his bench went to 500 - 400 = 100 pounds. After training it increased to 100 * 3 = 300 pounds.
So the answer is 300.