------------------------------------ Define x: ------------------------------------ Let x be the calories of the old chocolate bar. Apple = 1/4 x - 10 ←First Step : Define apple with reference to the choc
------------------------------------ Information Given: ------------------------------------ Apple = 70 Calories
------------------------------------ Find x: ------------------------------------ 1/4 x - 10 = 70 1/4 x = 80 x = 320 calories
------------------------------------------------------------------------ Answer: The old chocolate bar is 320 calories. ------------------------------------------------------------------------