Example 4 (Page 66) - Chapter 3 Class 8 - Proportional Reasoning-2 (Ganita Prakash II)

Last updated at August 14, 2026 by

2 pumps can fill a tank in 18 hours. How much time will it take to - Inverse Proportions

part 2 - Example 4 (Page 66) - Inverse Proportions - Chapter 3 Class 8 - Proportional Reasoning-2 (Ganita Prakash II) - Class 8 (Ganita Prakash - 1, 2 & Old NCERT)

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Example 4 (Page 66) 2 pumps can fill a tank in 18 hours. How much time will it take to fill the tank if we add 2 more pumps of the same kind?Given that, 2 pumps can fill tank in 18 hours We need to find much time would it take if we add 2 more pumps So, Total pumps are now = 2 + 2 = 4 Let the Time taken be y hours Now, we draw a table Now, As Number of pumps increase Time taken to fill the tank will decrease So, they are in Inverse Proportion So, we write numbers as ๐’™_๐Ÿ ๐’š_๐Ÿ = ๐’™_๐Ÿ ๐’š_๐Ÿ 2 ร— 18 = 4 ร— ๐‘ฆ (2 ร— 18)/4=๐‘ฆ 9 = ๐‘ฆ ๐’š = 9 So, it will take 9 hours

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