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1. A shirt and a pair of socks cost $120 in total. The shirt costs $100 more than the socks. How much do the socks cost?

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2. If Tessa can paint Phil’s house in 12 days, and Larry can paint Phil’s house in 24 days, how long would it take them both to paint Phil’s house together? ______ days

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3. A class of students was lined up in a single-file line. Jerry was the 11th student from the front and the 11th from the back of the line. How many students were lined up?

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4. If it takes 10 knitting machines 10 hours to knit 10 sweaters, how long would it take 50 knitting machines to knit 50 sweaters?

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5. The number of bacteria in a container doubles each hour. If it takes 32 hours to completely fill the container, how many hours would it take for the bacteria to fill half of the container?

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6. A man buys a rare coin for $130, sells it for $140, buys it back for $150, and sells it finally for $160. How much has he made?

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7. A man had two horses. He sold one of them for $198 and made a profit of 10%. The next day he sold the other one for $198, and took a loss of 10%. On the two deals combined, did he have a profit or a loss?

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8. Jake flew the 600 miles from Cleveland to Kansas City in a jet that averaged 600 miles per hour for the flight. He then flew the 600 miles from Kansas City to Denver in a small private plane that averaged only 200 miles per hour. For the entire 1200 mile trip, what was the average speed that Jake travelled?

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9. Simon decided to invest $8,000 in the stock market on January 17 in 2008. Six months after he invested, on July 17, the stocks he had purchased were down 50%. Fortunately for Simon, from July 17 to October 17, the stocks he had purchased went up 75%. At this point, Simon has:

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10. If it takes one minute to make each cut, how long will it take to cut a 25-foot wooden plank into 25 equal pieces?

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11. If the ratio of girls to boys in a town is 4 to 5, what fraction are girls?

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