Difference between revisions of "2018 AMC 10A Problems/Problem 3"
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Now we need to count <math>42</math> days after January 1. Since we start on Jan. 1, then we can't count that as a day itself. When we reach Jan. 31(The end of the month), we only have counted 30 days. <math>42 - 30 = 12</math>. Count <math>12</math> more days, resulting <math>\fbox{\textbf{(E) }\text{February 12}}</math> | Now we need to count <math>42</math> days after January 1. Since we start on Jan. 1, then we can't count that as a day itself. When we reach Jan. 31(The end of the month), we only have counted 30 days. <math>42 - 30 = 12</math>. Count <math>12</math> more days, resulting <math>\fbox{\textbf{(E) }\text{February 12}}</math> | ||
~nosysnow and Max0815 | ~nosysnow and Max0815 | ||
+ | |||
+ | ==Video Solution== | ||
+ | https://youtu.be/vO-ELYmgRI8 | ||
== See Also == | == See Also == |
Revision as of 06:14, 21 January 2020
Problem
A unit of blood expires after seconds. Yasin donates a unit of blood at noon of January 1. On what day does his unit of blood expire?
Solution 1
There are seconds that the blood has before expiring and there are
seconds in a day. Dividing
gives
days.
days after January 1 is
.
Solution 2
The problem says there are seconds.
Convert
seconds to minutes by dividing by
:
minutes.
Convert minutes to hours by again, dividing by
:
hours.
Convert hours to days by dividing by
:
days.
Now we need to count days after January 1. Since we start on Jan. 1, then we can't count that as a day itself. When we reach Jan. 31(The end of the month), we only have counted 30 days.
. Count
more days, resulting
~nosysnow and Max0815
Video Solution
See Also
2018 AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by Problem 2 |
Followed by Problem 4 | |
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 10 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.