SOLUTION: You spend $21 on food. The pizza costs twice as much as the burger, which cost twice as much as the chips. How much was the burger?

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Question 953675: You spend $21 on food. The pizza costs twice as much as the burger, which cost twice as much as the chips. How much was the burger?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
chips=c; burger=2c; pizza=4c
c+2c+4c=$21
7c=$21
c=$3
Burger=2c=2($3)=6$ ANSWER: Burgers cost $6.
CHECK
pizza=4c=4($3)=$12
chips+burger+pizza=$21
$3+$6+$12=$21
$21=$21