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Konrad509idn
x - dryer
3x - washer

[tex]x+3x=600\\ 4x=600\\ x=150[/tex]
Littlestaridn
let the charges of washer = x ..
charges of dryer is three times than x = 3x 
as we know their addition is 600 so
x + 3x = 600
4x = 600
dividing 4 on other side we get
x = 600 / 4 
x = 150..
charges of washer = x= 150 dollars
charges of dryer = 3x= 3 (150) = 450 dollars
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