If a: b :: 3 : 4, then what is (5a+6b): (a-2b)?  Choices:
A) 57:11	B) -57:11	C) 11 : 10	D) -39 : 5	E) -1 : 10
a/b= 3/4   -39 : 5ividing numerator &amp; denominator of ' (5a+6b)/(a-2b) 'by b,   [5(a/b)+6]/[(a/b)-2]= [5*(3/4)+6]/[(3/4)-2]= -39/5   ANSWER:-39 : 5
<result>D</result>
If a: b :: 3 : 4, then what is (5a+6b): (a-2b)?