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 the cost of a Pencil=x, Eraser=y & Sharpener=z
as per given conditions
Given 2x+5y+7y=30 and 3x+5z=15+6y
For satisfying both the conditions x=2,y=1,z=3
Therefore Cost of 39 erasers & 1 sharpener=39y+z
=39(1)+3=42
And cost of 6 pencil=6x=6(2)=12,

Difference=42-12=30 Rs