2016 AMC 12B Problems/Problem 2
Problem
The harmonic mean of two numbers can be calculated as twice their product divided by their sum. The harmonic mean of and
is closest to which integer?
Solution
Since the harmonic mean is times their product divided by their sum, we get the equation
which is then
which is finally closest to .
-dragonfly
You can also think of as
which it should be obvious that our number is most closest to 2 (
), our answer is
-dragonfly
You can also think of as
which it should be obvious that our number is most closest to 2 (
), our answer here is
See Also
2016 AMC 12B (Problems • Answer Key • Resources) | |
Preceded by Problem 1 |
Followed by Problem 3 |
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.