（15 ):24=35/(56 )=0.625=(62.5 )%
∵0.625=5/8
∴5/8=(5×3):(8×3)=15:24
5/8=(5×7)/(8×7)=35/56
0.625=(0.625×100)/100=62.5%
（ ):24=35/( )=0.625=( )%
（15 ):24=35/(56 )=0.625=(62.5 )%
∵0.625=5/8
∴5/8=(5×3):(8×3)=15:24
5/8=(5×7)/(8×7)=35/56
0.625=(0.625×100)/100=62.5%