MATH
posted by HEATHER on .
McDonalds sells 6 times as many orders of French fries as Harry's Hamburger Hut every day. If both sold 60 more orders McDonalds would sell only 3 times as many fries. How many orders of fries do each sell before and after the increase?

Let x be the orders Harry sold
y be the orders McDonal sold
x + y = 60 (1)
and y/x = 3 (2)
s0lve this system x =15, y =45
after increase
H. sold 15+15 =30
Mc. sold 15*6 + 45 = 135 
M = 6H
if each sold 60 more ...
M+60 = 3(H+60)
6H + 60 = 3H + 180
3H = 120
H = 40
M = 240
check: after increase
H = 100
M = 300
is 300 three times 100 ?
check!!