3 Variables - 2 Equations - A Unique Approach | Quantitative Aptitude | Ronak Shah

How to solve 3 Variables - 2 Equations . Let's look at A Unique Approach.

Question:
The cost of 5 pens, 7 pencils and 11 erasers is Rs. 111. The cost of 3 pens, 4 pencils and,5 erasers is Rs. 61. Find the cost (in Rs.) of 5 pens, 6 pencils and 3 erasers?

5P + 7Q + 11R = 111
3P + 4Q + 5R = 61
-----------------
5P + 6Q + 3R = ?

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You will frequently find equations based questions in the Quantitative Ability section of CAT exam. These questions can be solved easily after understanding some points and formula. Let's look at each one of them.

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#3equations2Variable, #algebra , #quantitativeaptitude