Question

已知b分之a=3比2,a分之c=6比5.求b分之c=?（2）已知a比b=9比7,b比c=5比3.求a比b比c

Answer 1

a/b=3/2 b=a*2/3

a/c=6/5 c=a*5/6

b/c= (2/3)/(5/6)=4/5

a:b=9:7=45:35

b:c=5:3=35:21

a:b:c=45:35:21