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Math Word Problems - GED, PSAT, SAT, ACT, GRE Preparation
7.10 Inverse Variation or Inverse Proportion

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Q 1: 24 people can construct a house in 15 days. But the owner would like to finish the work in 12 days. How many more workers should he employ?
8
6
7

Q 2: At the rate of 28 lines per page, a book has 300 pages. If the book has to contain only 280 pages, how many lines should a page contain?
30 lines
29 lines
32 lines

Q 3: The number 'r' varies inversely as 's' and the constant of variation is 20. Find s when r=5; and find r when s=-2.
4 and -10 respectively
5 and -10 respectively
-10 and 5 respectively
-10 and 4 respectively

Q 4: Some people working at the rate of 6 hours a day can complete the work in 19 1/2 days. As they have received another contract, they want to finish this work early. Now they start working 6 1/2 hours a day. In how many days will they finish this work?
18 days
20 days
16 days

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