4/20=(4*5)/(20*5)=20/100=20%
15/25=(15*4)/(25*4)=60/100=60%
13/50=(13*2)/(50*2)=26/100=26%
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4/20=(4*5)/(20*5)=20/100=20%
15/25=(15*4)/(25*4)=60/100=60%
13/50=(13*2)/(50*2)=26/100=26%