If the average of the first four numbers in an array is 20 and the average of the last four numbers is 19, then the 5th digit of the array is 18, what is the first number?
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the average of the first four numbers in an array is 20 and the average of the ... four numbers is 19, then the 5th digit of the array is 18, what is the first number? ... Add your answer and earn points.
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