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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?
7
8
6

Q 2: 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.
-10 and 4 respectively
5 and -10 respectively
-10 and 5 respectively
4 and -10 respectively

Q 3: 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?
32 lines
30 lines
29 lines

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