Jawabanmu

2014-01-24T20:27:45+07:00
S-x=30
   x=1/6s
 x:s=1:6 selisih perbandingan 5
   

x=1/5*30=6
   
 
s=6/5*30=36


x/t=6/7
6/y=6/7
y=7


t=s/t=x/y
36/t=6/7
6t=7*36
6t=252
t=252/6
t=42