Bob has 3/4 as much money as Dan. Dan received another $15. As a result, Bob had 6/11 as much money as Dan. How much did Dan have at first?
+36916 b = 3/4 d <======Given
then
b = 6/11( d+15) Sub in the red equation
3/4d = 6/11d + 90/11
d = 40 dollars originally
