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Question 149
The cost of 12 note-books and 16 pens is Rs. 852. What is the cost of 9 note-books and 12 pen?
Solution
Let the cost of a note-book = Rs. $$x$$
and cost of a pen = Rs. $$y$$
=> $$12x + 16y = 852$$
Multiplying the above equation by $$(\frac{3}{4})$$, we get :
=> $$\frac{3}{4} \times (12x + 16y = 852)$$
=> $$9x + 12y = 639$$
$$\therefore$$ Cost of 9 note-books and 12 pens is Rs. 639
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