Mohit and Sudesh bought pens and notebooks from the same shop. Mohit bought 3 pens and 6 notebooks by paying an amount of ₹180. Sudesh bought 5 pens and 2 notebooks by paying an amount of ₹116. How much did Mohit spend on buying notebooks?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Rs 138.
Let the cost of one pen = Rs x
And the cost of one notebook = Rs y
According to the question;
1. 3x + 6y = 180
⇒ y = (180 - 3x) / 6
2. 5x + 2y = 116
⇒ 5x +2((180 - 3x) / 6) = 116
Solving these two linear equations;
x = 14 and y = 23
So, cost of one pen = Rs. 14.
Cost of one notebook = Rs. 23
Mohint spent 6y = 6(23) = 138 rupees