In a certain school, the ratio of boys to girls is 5 to 13. If there are 80 more girls than boys, how many boys are there?
Pick one.
A) 27 B) 36 C) 45 D) 50 E) 117
The ratio of b to G is 5:13 and the other data point is G are more than boys by 80...   Looking at the ratio we can say that the 8(13-5) extra parts caused this diff of 80. so 1 part corresponds to 80/8= 
<gadget id="calculator">80/8</gadget>
<output>10</output>
10 and so   5 parts correspond to 5*10= 
<gadget id="calculator">5*10</gadget>
<output>50</output>
50.   50
<result>D</result>
In a certain school, the ratio of boys to girls is 5 to 13. If there are 80 more girls than boys, how many boys are there?