Inverse Proportion Monday, 25 February 2019

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Presentation transcript:

Inverse Proportion Monday, 25 February 2019 Unitary Methods Inverse Proportion Monday, 25 February 2019

Example If 6 men can build a wall in 8 hours, how long will it take 4 men? 6 men = 8 hours 1 man = 8 x 6 = 48 hours 48 4 men = = 12 hours 4

Example A farmer has enough hay to feed 8 sheep for 5 days. How long would the hay last for 2 Sheep? 10 Sheep? 8 Sheep = 5 days 1 Sheep = 8 x 5 = 40 days 40 (a) 2 Sheep = = 20 days 2 40 (b) 10 Sheep = = 4 days 10

Example A factory is painted by 12 men in 6 days. How long would it have taken with 8 men? 12 men = 6 days 1 man = 12 x 6 = 72 days 72 8 men = = 9 days 8

Example A group of 7 people can complete a task in 12 minutes. How long would it take 4 people? 7 people = 12 minutes 1 person= 7 x 12 = 84 minutes 84 4 people = = 21 minutes 4