Question

The total cost of 2 pencils, 5 erasers, and 7 sharpeners is rs.30, while 3 pencils and 5 sharpeners cost rs. 15 more than 6 erasers. by what amount (in rs.) does the cost of 39 erasers and 1 sharpener exceed the cost of 6 pencils

Answer 1

Let
cost of 1 pencil = x Rs.
cost of 1 eraser = y Rs.
cost of 1 sharpener = z Rs.

Acc. to Question
2x+5y+7z=30 ..........(1)
3x+5z= 6y+15 ...........(2)

we need to find
39y + z - 6x = ??

solve (1) and (2) to get the answer.