Proportionality -- Problems (2)

PROPORTIONALITY

PROBLEMS (2)

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18. The time it takes to do a job is inversely proportional to the number
18. of workers. Therefore, if 4 workers can do a job in 7 hours,

18. a) how long will in take 8 workers to do that job? 3½ hours.

18. b) how long will in take 2 workers to do that job? 14 hours.

19. If 5 men can paint a house in 36 hours,

19. a) how many men would be needed to paint the house in 12
19. a) hours? 15

19. b) how long would it take 1 man to paint the house? 180 hours.

10. The speed that a car can achieve after 10 seconds is inversely
10. proportional to its weight. A car that weighs 1800 pounds got to 56
10. miles per hour. How fast could it have gone if it had weighed

10. a) 3600 pounds? 28 mph

10. b) 900 pounds? 112 mph

10. c) 1200 pounds? 84 mph

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