Bill is twice as old as his brother Dan. 12 years ago, Bill was eight times as old as Dan was. How old is Bill now?
b = bill now = 2d d = dan's age
2d-12 = 8 (d-12) solve for dan's age
84 = 6d
d = 14 the b = 2d = 28 y/o
+1678 
+37146 
