In a certain school, the ratio of boys to girls is 5 to 13. If there are 128 more girls than boys, how many boys are there?	Choose one
A) 27	B) 36	C) 45	D) 72	E) 80
The ratio of b to G is 5:13 and the other data point is G are more than boys by 128...   Looking at the ratio we can say that the 8(13-5) extra parts caused this diff of 128. so 1 part corresponds to 128/8= 
<gadget id="calculator">128/8</gadget>
<output>16</output>
16 and so   5 parts correspond to 5*16= 
<gadget id="calculator">5*16</gadget>
<output>80</output>
80.   80
<result>E</result>
In a certain school, the ratio of boys to girls is 5 to 13. If there are 128 more girls than boys, how many boys are there?