Difference between revisions of "2018 AMC 10A Problems/Problem 3"
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<math>42</math> days after January 1 is <math>\fbox{\textbf{(E) }\text{February 12}}</math> | <math>42</math> days after January 1 is <math>\fbox{\textbf{(E) }\text{February 12}}</math> | ||
Keep in mind that you start on January 1st so you can't count it as a day. By the time you get to noon on January 31, only 30 days have past. Them you can continue counting like you normally would to February 12. | Keep in mind that you start on January 1st so you can't count it as a day. By the time you get to noon on January 31, only 30 days have past. Them you can continue counting like you normally would to February 12. | ||
| − | ~Nosysnow | + | ~Nosysnow |
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== See Also == | == See Also == | ||
Revision as of 20:47, 16 February 2018
Contents
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
.
Convert seconds to minutes: 
minutes.
Convert minutes to hours: 
hours.
Convert hours to days: 
days.
days after January 1 is
Keep in mind that you start on January 1st so you can't count it as a day. By the time you get to noon on January 31, only 30 days have past. Them you can continue counting like you normally would to February 12.
~Nosysnow
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. 
