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Verified Answer :

Peppermint98

1.Simplified each one 
2/5 (both divided by 7) ,  1/2 (divided by 21)
2.Make them into integer
(2/5 )(2/2)=4/10    ,    (1/2)(5/5)=5/10
Now the dominators are the same ,you can just compare the numerators. It is 4:5

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