Difference between revisions of "2019 AMC 8 Problems/Problem 11"

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==Solution 1==
 
==Solution 1==
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Let <math>x</math> be the number of students taking both a math and a foreign language class.
  
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By P-I-E, we get <math>70 + 54 - x</math> = <math>93</math>.
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Solving gives us <math>x = 31</math>.
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But we want the number of students taking only a math class.
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Which is <math>70 - 31 = 39</math>.
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<math>\boxed{\textbf{(D)}\ 39}</math>
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~phoenixfire
  
 
==See Also==
 
==See Also==

Revision as of 13:52, 20 November 2019

Problem 11

The eighth grade class at Lincoln Middle School has $93$ students. Each student takes a math class or a foreign language class or both. There are $70$ eigth graders taking a math class, and there are $54$ eight graders taking a foreign language class. How many eigth graders take $\textit{only}$ a math class and $\textit{not}$ a foreign language class?

$\textbf{(A) }16\qquad\textbf{(B) }23\qquad\textbf{(C) }31\qquad\textbf{(D) }39\qquad\textbf{(E) }70$

Solution 1

Let $x$ be the number of students taking both a math and a foreign language class.

By P-I-E, we get $70 + 54 - x$ = $93$.

Solving gives us $x = 31$.

But we want the number of students taking only a math class.

Which is $70 - 31 = 39$.

$\boxed{\textbf{(D)}\ 39}$

~phoenixfire

See Also

2019 AMC 8 (ProblemsAnswer KeyResources)
Preceded by
Problem 10
Followed by
Problem 12
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

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