2010
Mathematics
67ca00ce0c643c71d77dee1f
Find r, if 6r78 = 5119
A.
3
B.
2
C.
6
D.
5
Correct Answer: 3
Explanation
6r78 = 5119 6 x 82 + r x 81 + 7 x 80 = 5 x 92 + 1 x 91 + 1 x 90 6 x 64 + 8r + 7 x 1 = 5 x 81 + 9 + 1 x 1 384 + 8r + 7 = 405 + 9 + 1 8r = 415 - 391 8r = 24 r = 24/8 = 3
6r78 = 5119 6 x 82 + r x 81 + 7 x 80 = 5 x 92 + 1 x 91 + 1 x 90 6 x 64 + 8r + 7 x 1 = 5 x 81 + 9 + 1 x 1 384 + 8r + 7 = 405 + 9 + 1 8r = 415 - 391 8r = 24 r = 24/8 = 3THIS WEEK's
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