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7.10 Inverse Variation or Inverse Proportion
Inverse Variation or Indirect Variation
Answer the following questions. Also write at least ten examples of your own.
: 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 5 respectively
5 and -10 respectively
4 and -10 respectively
-10 and 4 respectively
: If y varies inversely as x; and x=6 when y=-3, find y when x=-9.
: It is known that current (A) in an electric circuit is inversely proportional to the resistance (R) in the circuit. When the resistance is 3 ohms, the current is 2 amperes. Find the resistance if the current is 5 amperes; and find the current when the r
1 ohms and 1 amperes respectively
2 ohms and 1 amperes respectively
1.2 ohms and 1.2 amperes respectively
: A farmer has enough grain to feed 50 cattle for 10 days. He sells 10 cattle. For how many days will the grain last now?
: 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?
: The groceries in a home of 4 members are enough for 30 days. If a guest comes and stays with them, how many days will the groceries last?
: 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?
: 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?
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