1. A large volume of water is gushing through a pipe which narrows at the outlet. At which point, A, B, C or D will the water flow fastest?
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2. How many cases do you need if you have to pack 112 pairs of shoes into cases that each hold 28 shoes?
3. At each stage the black dot moves three corners clockwise and the white dot moves four corners anticlockwise. After how many stages will both dots be together in the same corner?
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