The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers. What is the difference between the first and the third of these three numbers?
Choose the correct option: A) 15 B) 45 C) 60 D) Data inadequate E) None of these
Set the first, second and third no be F, S and T   Respectively F+S/2=S+T/2+15 Solving, we get F – T = 30.   Answer None of these
<result>E</result>
The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers. What is the difference between the first and the third of these three numbers?