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Find r, if 6r78 = 5119



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  • 6r78 = 5119
    6 x 82 + r x 81 + 7 x 8o = 5 x 92 + 1 x 91 + 1 x 9o
    6 x 64 + 8r + 7 x 1 = 5 x 81 + 9 + 1
    384+8r+7 = 405+9+1
    391+8r = 415
    8r = 415-319
    8r = 24
    r = 24/8
    r = 3

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  • 6r78 = 5119
    6 x 82 + r x 81 + 7 x 8o = 5 x 92 + 1 x 91 + 1 x 9o
    6 x 64 + 8r + 7 x 1 = 5 x 81 + 9 + 1 x 1
    384 + 8r + 7 = 405 + 9 + 1
    391 + 8r = 24
    r = \(\frac{24}{8}\)
    = 3