Arnold and Danny are two twin brothers that are celebrating their birthday. The product of their ages today is smaller by 17 from the product of their ages a year from today. What is their age today?	Answers.
A) 2.  B) 4.  C) 5.  D) 7.  E) 8.
ad = (a+1) (d+1) -17   0= a+d-16   a+d = 16   a=d (as they are twin brothers)   a=d=8   8. is the answer
<result>E</result>
Arnold and Danny are two twin brothers that are celebrating their birthday. The product of their ages today is smaller by 17 from the product of their ages a year from today. What is their age today?