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2023 AMC 8 Problems/Problem 9: Difference between revisions

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==Problem==  
==Problem==  
Malaika is skiing on a mountain. The graph below shows her elevation, in meters, above the base of the mountain as she skis along a trail. In total, how many seconds does she spend at an elevation between 4 and 7 meters?
Malaika is skiing on a mountain. The graph below shows her elevation, in meters, above the base of the mountain as she skis along a trail. In total, how many seconds does she spend at an elevation between <math>4</math> and <math>7</math> meters?
 
[[Image:2023 AMC 8-9.png|center|400px]]
[[Image:2023 AMC 8-9.png|center|400px]]
<math>\textbf{(A)}\ 6 \qquad \textbf{(B)}\ 8 \qquad \textbf{(C)}\ 10 \qquad \textbf{(D)}\ 12 \qquad \textbf{(E)}\ 14</math>
<math>\textbf{(A)}\ 6 \qquad \textbf{(B)}\ 8 \qquad \textbf{(C)}\ 10 \qquad \textbf{(D)}\ 12 \qquad \textbf{(E)}\ 14</math>


==Solution==
==Solution==
The time intervals in which Malaika's elevation is between <math>4</math> and <math>7</math> meters are:
* from the <math>2</math>nd to the <math>4</math>th seconds


From our graph we can read the graph to see that the answer is <math>2+4+2 = \boxed {{(B)}8}</math>
* from the <math>6</math>th to the <math>10</math>th seconds
-apex304
 
* from the <math>12</math>th to the <math>14</math>th seconds
 
In total, Malaika spends <math>(4-2) + (10-6) + (14-12) = \boxed{\textbf{(B)}\ 8}</math> seconds at such elevation.
 
~apex304, MRENTHUSIASM


== Video Solution 1 by SpreadTheMathLove==  
== Video Solution 1 by SpreadTheMathLove==  
https://www.youtube.com/watch?v=lfyg5ZMV0gg
https://www.youtube.com/watch?v=lfyg5ZMV0gg
==See Also==
{{AMC8 box|year=2023|num-b=8|num-a=10}}
{{MAA Notice}}

Revision as of 02:48, 25 January 2023

Problem

Malaika is skiing on a mountain. The graph below shows her elevation, in meters, above the base of the mountain as she skis along a trail. In total, how many seconds does she spend at an elevation between $4$ and $7$ meters?

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$\textbf{(A)}\ 6 \qquad \textbf{(B)}\ 8 \qquad \textbf{(C)}\ 10 \qquad \textbf{(D)}\ 12 \qquad \textbf{(E)}\ 14$

Solution

The time intervals in which Malaika's elevation is between $4$ and $7$ meters are:

  • from the $2$nd to the $4$th seconds
  • from the $6$th to the $10$th seconds
  • from the $12$th to the $14$th seconds

In total, Malaika spends $(4-2) + (10-6) + (14-12) = \boxed{\textbf{(B)}\ 8}$ seconds at such elevation.

~apex304, MRENTHUSIASM

Video Solution 1 by SpreadTheMathLove

https://www.youtube.com/watch?v=lfyg5ZMV0gg

See Also

2023 AMC 8 (Problems • Answer Key • Resources)
Preceded by
Problem 8 		Followed by
Problem 10
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 AJHSME/AMC 8 Problems and Solutions

These problems are copyrighted © by the Mathematical Association of America, as part of the American Mathematics Competitions. Error creating thumbnail: Unable to save thumbnail to destination

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