Math Word Problems - GED, PSAT, SAT, ACT, GRE Preparation 7.4 Inverse Variation or Inverse Proportion

Inverse Variation or Indirect Variation Directions: Answer the following questions. Also write at least ten examples of your own.

Q 1: 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

Q 2: 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? 9 4 5

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. -10 and 5 respectively 4 and -10 respectively 5 and -10 respectively -10 and 4 respectively

Q 4: 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 29 lines 30 lines

Q 5: 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 16 days 20 days

Q 6: 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 7: 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? 28 days 26 days 24 days

Q 8: If y varies inversely as x; and x=6 when y=-3, find y when x=-9. 2 6 3

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!