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17 January, 09:18

The sum of 5 consecutive integers is 100. What is the first number in this sequence?

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  1. 17 January, 11:43
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    So we can call first number "n"

    Then all five integers would be n, n+1, n+2, n+3, n+4

    So sum of them would be 5n + 10 = 100

    Now you can solve for n:

    5n + 10 = 100

    5n = 90

    n = 18

    Verify: 18 + 19 + 20 + 21 + 22 = 100. All good.

    So answer is 18
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