Comparing Quantities Using Ratio


 
 
Concept Explanation
 

Comparing Quantities Using Ratios

Quantities can be compared using ratios. the quantities can be be compared is they are of the same type and in same units. Comparison between two becomes meaningless if they are not of the same kind of they are not expressed in same units. For example it is meaningless to compare 25 pencils to 35 oranges. Also to compare Kg with grams will not give proper results. So before comparing they must be expressed in the same units.

Illustration: Robin worked for 8 hours and Rubin worked for 2 hours. How many times Robin’s working hours as compared to Rubin working hours?

Solution: Working hours of Robin = 8 hours Working hours of Rubin = 2 hours The ratio of working hours of Robin to Rubin = 8 : 2 = 4 : 1.

Therefore, Robin works four times more than Rubin works.

Sample Questions
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Question : 1

Seema has 24 red pens and 48 green pens. How many times does Seema has green pens as compared to red pens?

Right Option : A
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Explanation
Question : 2

Smith studied for 9 hours and Susan studied for 12 hours. How many times Smith studied as compared to Susan?

Right Option : D
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Explanation
Question : 3

Find the ratio of Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour  ?

Right Option : B
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Explanation
 
 
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