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Tell whether the ratios form a proportion 3/5 ,15/20

I need help with my math homework. They gave us a older question that we probably should know the answer to but I don't. Another thing is fractions are hard for me so help would be appreciated. Please help.
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3 : 5 =? 15 : 20           proportion
(3)(20) =? (5)(15)       product means/extremes