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30 August, 23:30

The sum of 5 consecutive odd numbers is 135. What is the second number in this sequence?

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  1. 31 August, 00:09
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    Any even number is 2n. Therefore, 2n+1 is an odd number. Apply this logic:

    (2n+1) + (2n+3) + (2n+5) + (2n+7) + (2n+9) = 135

    10n+25=135

    10n=110

    n=11

    So the second number in the sequence is 2n+3 = 25.
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