Q2 of 26 Page 100

Venkat uncle will make 4 shirts of same size with 20 meters of cloth.Let’s work out using the the Rule of Three method how many meters of cloth Venkat uncle will have to purchase for making 12 such shirts.

theorem1:-


The Rule of Three is a Mathematical Rule that allows you to solve problems based on proportions. By having three numbers: a, b, c,


(a)Direct proportions rule of 3:-


if ab


c


then


(b)inverse proportions rule of 3:-


if ab


c then


formula:- (i)direct method----


(ii)indirect or inverse proportions xy=k


given:-method used is called direct proportions method


20m of cloth gives 4 shirts



1 shirt will required



12 shirt will required


of cloth


therefore 12 shirt will required 60 m of cloth


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1

Today my father has bought 15kg. Of rice for Rs. 390. Let’s work out using the Rule of Three method how much he would require if he would have bought the same quality of 17 kg of rice.

 3

It took 15 days for 30 heads of labourers to dig a pond at Bakultala village. Let’s work out using the the Rule of Three method in how many days 25 heads of labourers could have completer the said work.

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