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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 4 respectively
5 and -10 respectively
-10 and 5 respectively
4 and -10 respectively
: 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?
: In an army camp, there is food for 8 weeks for 1200 people. After 3 weeks, 300 more soldiers joined the camp. For how many more weeks will the food last?
another 5 weeks
another 3 weeks
another 4 weeks
: 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?
: 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?
: 35 carts are needed to transport the entire grain in a warehouse at the rate of 8 bags a truck. But the truck drivers objected saying it was too heavy and carried only 7 bags a truck. How many more trucks are needed to transport the grain?
: If y varies inversely as x; and x=6 when y=-3, find y when x=-9.
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