An easy method to find answer for the questions in unitary method.
eg-the weight of 72 books is 9kg. What is weight of 40 such books?
answer - unknown quantity / known quantity x required
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the weight of 72 books =9kg �the weight of 1 book= 0.125kg the weight of 40 books =40*0.125 � � � � � � � � � � � � � � � � �=5kg
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