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Ex 11.2, 6 A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?Given, 3 persons can rewire the house in 4 days We need to find how many days would it take if number of workers is 4 Let the number of days be y Thus, our table looks like As we increase the number of persons, time taken would decrease ∴ They are in inverse proportion 3 × 4 = 3 × 𝒚 (3 × 4)/3 = 𝑦 4 = 𝑦 𝒚 = 4 ∴ It would require 4 days to complete the job

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.