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5 pencil and 7 pens togther cost rupee 50 whreas 7 pencil and5 pens together cost rupee 46 find the cost of one pencil and that of one pen ???

Posted by Diya Rajput 4 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 4 years, 11 months ago

Let pencil be x and let pen be y
5x+7y=50
7x+5y=46
multiply first equation by 7
35x+49y = 350
multiply second equation by 5
35x+25y=230
solving them we get 24y=120 which gives y is 5 rupees
substituting in second equation we get x is 3 rupees

3Thank You

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