Question

solve this question.

Answer 1

let the cost of 1 pen be X rupees
let the cost of one pencil be Y rupees
let the cost of one eraser be Z rupees
then cost of 3 pens ,2 pencils,4 erasers=3X+2Y+4Z=$92
then cost of 8 pencils and 16 erasers=$68=8Y+16Z
then the cost of 24 pens is 24X=?
(3X+2Y+4Z=92)4
8Y+16Z=68

12X+8Y+16Z=368
8Y+16Z=68
- - -
12X=300
X=300/12
then the cost of 24 pens is
24×300/12
=600