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MEAP Preparation - Grade 7 Mathematics
2.17 Inverse Variation or Inverse Proportion
Inverse Variation or Indirect Variation
Answer the following questions. Also write at least ten examples of your own.
: 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 4 weeks
another 3 weeks
another 5 weeks
: If y varies inversely as x; and x=6 when y=-3, find y when x=-9.
: 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?
: 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?
: 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
2 ohms and 1 amperes respectively
1.2 ohms and 1.2 amperes respectively
1 ohms and 1 amperes respectively
: 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?
: 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
-10 and 4 respectively
5 and -10 respectively
-10 and 5 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?
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