please teach me maths, thanks

兩邊各除１變成

a:b:c=1/2:1/5:1/4

a:b:c=0.5:0.2:0.25

a=0.5
b=0.2
c=0.25

2007-04-28 18:15:36 補充：
再將數值各乘２０(用1除0.5再除0.2再除0.25) 化為整數。得出final answer:a=10b=4c=5

L.C.M of a , b , c is 20

a : b : c = 1 / ( 2 / 20 ) : 1 / ( 5 / 20 ) : 1 / ( 4 / 20 )

a : b : c = 10 : 4 : 5