1.

5 pencils and 7pens together cost Rs. 50 whereas 7 pencils and 5 pens togethercost Rs. 46. Find the cost of one pencil and that of one pen.​

Answer»

Answer:

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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