Question

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

Answer 1

Answer:

pen=5,pencil cost=3

Step-by-step explanation:

I hope this helps u

Answer 2

Answer:

cost of pencil = rs 3

cost of pen = rs 5

Step-by-step explanation:

let the cost of pencil be x and cost of pen be y.

According to the question....

5x + 7y = 50 .... eq i

and

7x + 5y = 46 .... eq ii

solving equation i

5x + 7y = 50

=> 5x = 50-7y

=> x = 50-7y

5

=> x = 10 - 7y/5

putting the value of x in eq ii

=> 7 (10 - 7y/5) + 5y = 46

=> 70 - 49y/5 + 5y = 46

=> 49y/5 - 5y = 70-46

=> 49y-25y = 24

5

=>24y = 24 × 5

=> y = 5

x = 50- 7y

5

=> x = 50 - 35

5

=> x = 15/5

=> x = 3