Difference between revisions of "2024 AMC 8 Problems/Problem 7"

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==Problem==
 
==Problem==
  
A <math>3x7</math> rectangle is covered without overlap by 3 shapes of tiles: <math>2x2</math>, <math>1x4</math>, and <math>1x1</math>, shown below. What is the minimum possible number of <math>1x1 tiles used?
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A <math>3</math>x<math>7</math> rectangle is covered without overlap by 3 shapes of tiles: <math>2</math>x<math>2</math>, <math>1</math>x<math>4</math>, and <math>1</math>x<math>1</math>, shown below. What is the minimum possible number of <math>1</math>x<math>1</math> tiles used?
  
  
(A) </math>1<math>  (B) </math>2<math>  (C) </math>3<math>  (D) </math>4<math>  (E) </math>5$
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(A) <math>1</math>  (B) <math>2</math>  (C) <math>3</math>  (D) <math>4</math>  (E) <math>5</math>
  
 
==Solution 1==
 
==Solution 1==

Revision as of 17:11, 25 January 2024

Problem

A $3$x$7$ rectangle is covered without overlap by 3 shapes of tiles: $2$x$2$, $1$x$4$, and $1$x$1$, shown below. What is the minimum possible number of $1$x$1$ tiles used?


(A) $1$ (B) $2$ (C) $3$ (D) $4$ (E) $5$

Solution 1

We can eliminate B, C, and D, because they are not $21-$ any multiple of $4$. Finally, we see that there is no way to have A, so the solution is $(E) \boxed{5}$.

Solution 1

Video Solution 1(easy to digest) by Power Solve

https://youtu.be/16YYti_pDUg?si=KjRhUdCOAx10kgiW&t=59