Prep 1 - DS 128

128. 

The points A, B, C, and D are on a number line, not necessarily in that order.  If the distance between A and B is 18 and the distance between C and D is 8, what is the distance between B and D ?

(1) The distance between C and A is the same as the distance between C and B.

(2) A is to the left of D on the number line.