Question

5 pencils and 7pens together cost Rs. 50 whereas 7 pencils and 5 pens together

cost Rs. 46. Find the cost of one pencil and that of one pen.​

Answer 1

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