Posted by Watermelon on .
The consecutive terms of an arithmetic progression are 5x, 8, 2x. Find the common difference of the progression.

AP calculus 
MathMate,
The common difference of an A.P. is constant, therefore, we can take the difference of consecutive terms and equate the values to determine x:
2x8 = 8  (5x) =>
2x  x = 85+8 =>
x = 11
or
common difference
=2x8
= 14