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

Last updated at July 23, 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)

Remove Ads

Transcript

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 𝒙_𝟏 𝒚_𝟏 = 𝒙_𝟐 𝒚_𝟐 2 × 18 = 4 × 𝑦 (2 × 18)/4=𝑦 9 = 𝑦 𝒚 = 9 So, it will take 9 hours

CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

For an uninterrupted learning experience, students can use Teachoo Black to remove ads and focus better.