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12. Jane has 2 red marbles, 4 blue marbles, and 5 green marbles, in her pocket. How many will she have to take out of her pocket to ensure that she has taken out at least one of each color?

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14. Two children can build a sandcastle in 3 hours. Susan can build three times as fast as Jane. How long will it take Jane to build the castle by herself?

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15. Four workers are able to place fourty tiles in ten minutes. How many workers are needed to place sixty tiles in twenty minutes?

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