Difference between revisions of "2002 AMC 12B Problems/Problem 15"
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Revision as of 10:22, 4 July 2013
Problem
How many four-digit numbers have the property that the three-digit number obtained by removing the leftmost digit is one ninth of
?
Solution
Let , such that
. Then
. Since
, from
we have
three-digit solutions, and the answer is
.
See also
2002 AMC 12B (Problems • Answer Key • Resources) | |
Preceded by Problem 14 |
Followed by Problem 16 |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
All AMC 12 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.