Math Riddles

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If 6 doubloons are worth 1 1/2 ducats, how many ducats are 27 doubloons worth?
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It takes the town hall clock 6 seconds to strike 4 o’clock in the afternoon. How long does it take to strike midnight?
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‘How much is this bag of potatoes?’ asked the man. ’32lb divided by half its own weight,’ said the green grocer. How much did the potatoes weigh?
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How can you insert the numbers 1-9 inclusive each only, into the calculation to arrive at the answer 100? ( – ) + + – – – = 100
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My age today is three times what it will be three years from now minus three times what my age was three years ago. How old am I?
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Mr. Grumper grumbles about bad time-keeping trains like everybody else. On one particular morning he was justified, though. The train left on time for the one hour journey and it arrived 5 minutes late. However, Mr. Grumper’s watch showed it to be 3 minutes early, so he adjusted his watch by putting it forward 3 minutes. His watch kept time during the day, and on the return journey in the evening the train started on time, according to his watch, and arrived on time, according to the station clock. If the train traveled 25 percent faster on the return journey than it did on the morning journey, was the station clock fast or slow, and by how much?
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