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Three workers, A,B,C are each laying 2,000 tiles. A does it in 10hrs, B in 12hrs, and C in 15 hrs, working alone. If they work together, how long will it take them?
Bully has a pail that contains 40 nails and weighs 175 grams. The same pail with 20 nails weighs 95 grams. How much does Bully's pail weigh with no nails in it? How much does each nail weigh?
Vivian measured a house and its lot and made a scale drawing. The porch, which is 16 feet wide in real life, is 4 inches wide in the drawing. What scale did Vivian use for the drawing?
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