Question

the price of a pen and a pencil is 18 rupees. The price of one pen and 4 pencils is 36 rupees. find the price of each​

Answer 1

Answer:

Given

Price of Pen and pencil is =18

price of pen and 4 pencils=36

let the price of pen be x and pen be y

in equation

x+y=18.

x=18-y...... 1

x+4y=36......2

substitute value of x in eqn 2

18-y+4y=36

18+3y=36

3y=36-18

3y=18

y=18/3

cost of 1 pencil =6₹

then substitute y value in equation 1

x=18-y

x=18-6

x=12

hence cost of pen is 12₹