Example 9 - If 15 workers can build a wall in 48 hours, how many

Example 9 - Chapter 13 Class 8 Direct and Inverse Proportions - Part 2


Transcript

Example 9 If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours? Given, 15 workers can build a wall in 48 hours We need to find how many workers will do the same work in 30 hours Let the number of workers be x Thus, our table looks like As we increase the number of workers, time taken to build the wall decreases ∴ They are in inverse proportion 15 × 48 = 𝑥 × 30 (15 × 48)/30 = 𝑥 (1 × 48)/2 = 𝑥 24 = 𝑥 𝑥 = 24 ∴ 24 workers are required to build the wall (𝑥1𝑦1=𝑥2𝑦2)

Go Ad-free
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.