(5):20=3/4=12÷( )=9:( )=( ):8

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(5):20=3/4=12÷()=9:()=():8(5):20=3/4=12÷()=9:()=():8 (5):20=3/4=12÷()=9:()=():815:20

(5):20=3/4=12÷( )=9:( )=( ):8
(5):20=3/4=12÷( )=9:( )=( ):8
 

(5):20=3/4=12÷( )=9:( )=( ):8
15:20