Two persons could fit new windows in a house in 3 days. (i) One of the persons fell ill before the work started. How long would the job take now? (ii) How many persons would be needed to fit the windows in one day?

(i) Let the number of days be x.
Persons 2 1
Days 3 x
Here, the number of persons and the number of days are in inverse proportion.
∴ 2/1 = x/3 ⇒ xX1=2×3 ⇒ x=2×3/1 = 6 days

(ii) Let the number of persons be x.
Persons 2 x
Days 3 1
Here, the number of persons and the number of days are in inverse proportion.
∴ 2/x = 1/3 ⇒ xX1=2×3 ⇒ x=2×3/1= 6 persons

Class 8 Maths Chapter 11 Exercise 13.2 Solution in Video

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