(x+1)+(x+2)+…+(x+20)=510

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(x+1)+(x+2)+…+(x+20)=510

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Doris 2 years 2020-10-31T03:27:06+00:00 2 Answers 64 views 0

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    0
    2020-10-31T03:28:06+00:00

    (x+1)+(x+2)+…+(x+20)=510

    => x +1 x +2 + x + 3 +…….+ x + 20 = 510

    => (x+x+x+…+x) + (1+2+3+….+20) = 510

    => 20x + [(20-1):1+1] . (20+1) : 2 = 510

    => 20x + 20 . 21 : 2 = 510

    => 20x + 210 = 510

    => 20x = 300

    => x = 15

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    0
    2020-10-31T03:28:49+00:00

    `(x+1)+(x+2)+…+(x+20)=510`

    ` x +1 x +2 + x + 3 +…….+ x + 20 = 510`

    ` (x+x+x+…+x) + (1+2+3+….+20) = 510`

     `20x + [(20-1):1+1] . (20+1) : 2 = 510`

     `20x + 20 . 21 : 2 = 510`

     `20x + 210 = 510`

     `20x = 300`

         `x = 15`

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