http://www.purplemath.com/modules/specfact.htm
9 chairs because 2 to 4 is equal to 1/2 and half of 18 chairs is 9
E=9h+1.5(9)(h-40)
e=9h+13.5(h-40), since h=49
e=9(40)+13.5(9)
e=9(40+13.5)
e=9(53.5)
e=$481.50
It depends on what the question looks like. If it looks like this:
(6-3)(2/5)=
(3)(0.4)=
1.2
