Question

5 pencils and 4 erasers cost Rs 13 whereas 9 pencils and 5 erasers cost Rs 19 Then the price of 6 pencils and 3 erasers is

Answer 1

Hey

Here is your answer,

Let the cost of pencils be x and erasers be y.

5x+4y=13
9x+5y=19

Multiply first equation with 5.
➡25x+20y=65

Multiply second equation with 4.
➡36x+20y=76

Solve both the equation,
25x+20y=65
36x+20y=76
---------------------
-11x = -11
x=1

5x+4y=13
4y=13-5
4y=8
y=2

Therefore the cost of pencil is rs. 1 and eraser is rs.2

Price of 6 pencils and 3 erases = 6x1+3x2
=6+6
=12

Hope it helps you!