A) 6a=5b so a=5/6*b a/b=5/6 b) 6a=5b so 6/5*a=b b/a=6/5 c) a/b=5/6 so (a/b)*(2/7)=2a/7b=(2/7)(5/6)=(5/21) d) 6a=5b so b=6a/5 Thus (a+b)/b=(a+6a/5)/(6a/5)=(11a/5)/(6a/5)=11/6 e) 6a=5b so a=5b/6 Thus (a+b)/(5a)=(5b/6+b)/(5*5b/6)=(11b/6)/(25b/6)=11/25 f) (3a+3b)/(a+b)=3=3/1