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What is the 5th of 9 consecutive whole numbers whose sum is 153 is what?

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sum(9) = (9/2)(2a + 8d) = 153
times 2
9(2a + 8d) = 306
18a + 72d = 306
divide by 18
a + 4d = 17

term(5) = a+4d = 17 from above

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