Cost of 20 pens and 17 pencils is Rs. 418. What is the cost of 60 pens and 51 pencils ?
C.P. of 1 pen = Rs. $$x$$
C.P. of 1 pencil = Rs. $$y$$
=> $$20x + 17y = 418$$
Multiplying above equations by 3
$$\therefore$$ $$60x + 51y = 1254$$
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