The cost of 12 note-books and 16 pens is Rs. 852. What is the cost of 9 note-books and 12 pens?
Question
The cost of 12 note-books and 16 pens is Rs. 852. What is the cost of 9 note-books and 12 pens?
Let the CP of 1 note book = Rs. X and CP of 1 pen = Rs. Y
According to the question, 12X + 16Y = 852
Dividing both sides by 4, 3X + 4Y = 213
=> 3(3X+4Y) = 3 x 213
=> 9X + 12Y = 639
Hence the cost of 9 note books and 12 pens is 639.
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