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In a bag, the number of $2 notes was 40% more than the number of $5 notes.
When 20% of the $5 notes were taken out, there were 24 less $5 notes than $2 notes in the bag.
(a) Find the number of $5 notes left in the bag.
(b) Calculate the difference in value of the $2 notes and the $5 notes in the bag at first.
Notes to student: