(50x)/(20y)= 1/2

x= 120-y

So 50 * (120-y)/(20y) =1/2.

50*( 120-y)*2=20y* 1

100*( 120-y)=20y

12000- 100y=20y

12000 = 100y+20y = 120y

y = 12000/ 120 = 100

x = 120-y = 120- 100 = 20

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