Question

5 pencils and 7 pens together for rupees 50 whereas 7 pencils and 5pens together for rupees 46 find the cost of one pencil and that of one pen ​

Answer 1

Explanation:

5x+7y =50 & 7x+5y=46

multiply both by 7 and 5 , we get;

35x+49y=350 & 35x+25y=230

subtract 2 from 1,we get;

24y=120

y=5

put value of y in 1 equation,we get ;

35x=105

x=3

so,cost of one pencil and one pen is 3&5