Answers

2015-01-27T19:45:30+05:30
Chairs=x
table=y
from we get from the question
10x=4y
x=4/10y   .....................1
15x+2y=4000
then put the value of x from the equation 1st
15(4/10)y+2y=4000
then we get the value of y=500
and this value putt the equation 1st 
x=(4/10)500
x=200
then price of 12 chairs and 3 tables
12x+3y  ..............2nd
and the put the value of x and y in eqation2nd
and so the total value=3900
1 2 1