Question

5pencil and 7pen together cost rs.50.whereas 7penc5pen together cost rs.46find the cost of one pencil and that of one pen


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Answer 1

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

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