Q4 of 26 Page 103

30 heads of people repair part of a road of a village in 15 days. Let’s work out using the method of the Rule of Three how many days it will take to repair the rest of the road if additional 10 heads of people join.

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:-w1=3/7,w2=4/7,d1=15,d2=?,p1=30,p2=40







d2=15


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