Question

3 pens, 5 pencils and 7 erasers cost Rs. 80 while 5 pens ,8 pencils and 12 eraser cost Rs. 120 . find the cost (in Rs.) of 3 pen, 6 pencils and 9 erasers ?

Answer 1

Answer:

Step-by-step explanation:

Let the price of each pen be x.

Let the price of each pencil be y.

Let the price of each eraser be z.

Now as per question,

3x+ 5y+7z= rs 80.

Again,

5x+8y+12z=120.

Now as here only two equation is there and three variables, so the solution is not possible.