Good Riddles

Question: A rich man named Steven goes to a bar and sees his long lost poor brother, Martin. "What've you been up to lately?" Steven says to Martin. "Well, one night, me and my daughter went fishing together. It was so much fun, probably the best time of my life. We told jokes and riddles and sang. In the end, we each caught two fish. We didn't have to buy food for so long, since each fish lasted us about three days," Martin said, grinning. He loved saving money, since he was less fortunate than Steven. Steven said, "Well, that's not SO much. Only 12 days worth of food. That's only 20 dollars or so of fish from the market." "For one thing, 20 dollars is a lot for ME. For another thing--brother, I may be much poorer than you, but at least I got an education! That's 18 days, my brother." Martin laughed. How was it 18 days, not 12?

Question: How many times can you subtract 10 from 100?

Question: People pick me, and watch me until they give me power. Then they don't stare in my eyes. What am I?

Question: Once you are in my sight, you are gone in a flash, and people tend to use me for cash. I am often used as a dire assist, and people often believe that I cause harm, when I am but its catalyst. What am I?

Question: What flag has five circles in it?