CAT Average, Ratio and Proportion is one of the most common parts in the section of arithmetic in Quantitative Aptitude. The questions based on ratio and proportion are easy to solve. In CAT 2021, around 2 to 3 questions can be expected from this section. Both MCQ or TITA type questions can be asked from this topic, therefore candidates are advised to download previous year question papers to get an idea about the questions that might get asked in the paper. Download CAT Question Papers
Read the article to know more about the basic concepts, properties, difference and important formulas required to solve the questions based on ratio and proportion
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Below are some formulas used in CAT Average, Ratio and Proportion are listed.
Terms | Formulas |
---|---|
Ratio Formula | a: b ⇒ a/b |
Proportion Formula | a/b = c/d or a : b :: c : d |
Fourth, Third and Mean Proportional | If a : b = c : d, then:
|
Terms | Properties |
---|---|
Proportion rule | a:b::c:d⇒ab=cd |
Dividendo | if a:b = c:d then a - b:b = c - d:d |
Componendo | if a:b = c:d then a + b:b = c + d:d |
Alternendo | if a:b = c:d then a:c = b:d |
Addendo | if a:b = c:d then a + c = b + d |
Subtrendo | if a:b = c:d then a - c = b - d |
Invertendo | if a:b = c:d then b:a = d:c |
Componendo | if a:b = c:d then a + b:a - b = c + d:c - d |
Average of ‘n’ consecutive Natural Numbers | ( n+1)/2 |
Average of the square of consecutive n natural numbers | (n+1)(2n+1)/6 |
In the below section, some solved questions regarding CAT Average, Ratio and Proportion are given.
Ques. There are 2 tanks with the same volume. Both the tanks are full of oil and water. At first, the ratio of oil and water is 5:8 and secondly, the ratio of both is 7:19. Find out the ratio of the oil and water when both the tanks are poured in a larger tank.
Correct Answer: ( D)
Ques. The ratio of a two-digit natural number to a number formed by reversing its digits is 4 : 7. Calculate the sum of all the numbers of all those pairs from the following list.
Correct Answer: ( C)
Ques. INR 432 is divided among three workers named A, B and C so that 8 times A’s share = 12 times B’s share = 6 times C’s share. Find out the amount A will get.
Correct Answer: ( B)
Ques. In a mixture of milk and water i.e 35 L, the ratio of milk to water is 4:1. The ratio of milk to water totally changed when 7 L water was added to that milk and water mixture. To bring back the primary ratio of milk and water, what quantity of milk needs to be added now?
Correct Answer: ( A)
Ques. A boy covered a distance of 1,000 km in 16 hr in total. He covered that distance in a taxi at 36 km/hr and also in a bus at 80 km/hr. What is the distance covered by the bus?
Correct Answer: ( C)
Ques. In a bottle of liquor, there are ¾ of liquor and the remaining is water. Find out the quantity of the mixture taken away and equal quantity of water to remain half liqueur and half water?
Correct Answer: ( A)
Ques.The weight of a lump of two metals is 18gm and is worth INR 87. The value can be INR 78.6 when their weights are interchanged. What is the weight of the other metal in the mixture when the price of one metal is INR 6.7 per gram?
Correct Answer: ( A)
Ques. What is the outcome by dividing INR 60 in the ratio 1:2 between Mike and John?
Correct Answer: ( A)
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In the below section, some tips for the preparation of CAT Average, Ratio and Proportion are given.
While solving questions on ratio and proportion candidates can identify ratio questions if they see the term ‘to every’ in the questions whereas questions on proportion can be identified with the term ‘out of’.
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*The article might have information for the previous academic years, please refer the official website of the exam.