Question

the cost of 3 pens or 7 pencils is Rs 21. What is the cost of 6 pens and 6 pencils

Answer 1

Please see the attachment

Answer 2

let as assume cost of 1 pen is x
and cost of 1 pencil is y
given 3pens or 7pencils cost is 21
then,
3x=21
x=7 --------------(1)
and 7y=21
y=3 -----------------(2)
we have to find 6x+6y
from 1 and 2 equations
6(7)+6(3)
=60
I HOPE THIS WILL HELP U