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11. Find the missing term in the following sequence:
3,8,18, __ ,78
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?
13. Find the missing number.
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?
15. Four workers are able to place fourty tiles in ten minutes. How many workers are needed to place sixty tiles in twenty minutes?