Tag Archives: Arithmetic

Two boats in a stream : Logic and solutions

Hope you found the two questions of the lasts post pretty easy to solve. And believe me, when I say, most uninitiated students would have found the questions tough. Here goes the thought process of solving them … Q. 5: … Continue reading

De-enigmification Alligationous

The unanswered question of the last post should have been an easy one. Since we are finding the weighted average of Speeds, the only way that A1 × w1 or Speed × w can make any sense is when w’s, the weights, are Time. … Continue reading

Enigma of Alligation unravelled

Understand that Alligation is the same as weighted average, with just a rearrangement of the terms …… . This is weighted average. On cross-multiplying and then re-arranging, Aavg × w1 + Aavg × w2 = A1 × w1 + A2 × w2 w1 × (Aavg – A1) = w2 … Continue reading

Ratio Super Post

A clear understanding of ratios is one of the keys to unraveling Arithmetic the other being the ability to translate the problems from mostly english to mostly maths. You will see ratios in action in topics like Percentages , Averages … Continue reading

Two boats in the same stream

CAT 2004 carried an innocuous question about two boats in a stream … Q. 1: Two boats, travelling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance of 20 kms from each … Continue reading

Enigma of Alligation

Weighted Averages Applications Most of the students who have already studied weighted averages would be aware of the utility of the process called Alligation. I, for one, believe that while Alligation is definitely useful, lots of concepts remain unexplained/unearthed while … Continue reading

Who saves more ?

Ratio Applications in CAT Ratios is a very easy topic (though very useful). And one of the easy type of questions on basic use of ratios is Q. 1: If the incomes of A and B are in the ratio … Continue reading

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Weighted averages visuals

Mixtures and allegations , Weighted averages ,scale methods or by any other name. As is our wont , this post too is bottoms up i.e we start with the simplest idea and build along adding various factors of difficulty as … Continue reading

CQ with Chandra 2

CAT quant with Chandra Session 2 Verbal methods (oral solutions ) for Direct and inverse Relations problems . Part 1 Pre Reading : Problem Definition : The total cost of a picnic for a group of 100 people is 3000 … Continue reading