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The total cost of 2 pencils, 5 erasers and 7 sharpeners is Rs.30, while 3 pencils and 5 sharpeners cost Rs.15 more than 6 erasers. By what amount (in Rs.) does the cost of 39 erasers and 1 sharpener exceed the cost of 6 pencils?

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Theoretically, you need 3 equations to solve linear equations with 3 variables. In this question, you are given only two equations with three variables. That means this problem comes under special equations. Depending upon the nature of the equations you have to apply special technique to solve special...
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Theoretically, you need 3 equations to solve linear equations with 3 variables. In this question, you are given only two equations with three variables. That means this problem comes under special equations. Depending upon the nature of the equations you have to apply special technique to solve special equation. Here, I apply one such special technique: 3x+5y+7z=49 (1) 5x+8y+11z=78 (2) multiply the first equation with 3 9x+15y+21z=147 (3) multiply the second equation with 2 10x+16x+22z=156 Now, subtract (3) from (2) x+y+z=9 read less
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i found on facebook that no quetion papers of 2009 -2014 not available and http://cat.examgroup.org will provide shortly so can you please provide those papers with solutions
Hi devang, buy topic wise CAT questions book (GK publications) in the book u will find all the questions of previous year CAT ( 1990 to 2008 actual and 2009 to 2014 memory based )
Devang
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Try to solve it by yourself. The answer should be 7A. If you are unable to solve it, I will be happy to provide you with detailed solution but first give it a try yourself.
Abhijeet Kumar Sinha
1 0
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