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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