1. The cost price of 12 pens and 6 pencils is Rs. 168. What will be the cost price of 18 pens and 9 pencils ?






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  • By: anil on 05 May 2019 01.43 am
    Let cost price of 1 pen = $$Rs. x$$ and cost price of 1 pencil = $$Rs. y$$ Acc. to ques, => $$12x + 6y = 168$$ Dividing both sides by 6, we get : => $$2x + y = 28$$ Now, multiplying both sides by 9, => $$9 (2x + y) = 9 (28)$$ => $$18x + 9y = 252$$ $$ herefore$$ Cost price of 18 pens and 9 pencils = Rs. 252
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