# 2008 AMC 8 Problems/Problem 20

## Problem

The students in Mr. Neatkin's class took a penmanship test. Two-thirds of the boys and $\frac{3}{4}$ of the girls passed the test, and an equal number of boys and girls passed the test. What is the minimum possible number of students in the class? $\textbf{(A)}\ 12\qquad \textbf{(B)}\ 17\qquad \textbf{(C)}\ 24\qquad \textbf{(D)}\ 27\qquad \textbf{(E)}\ 36$

## Solution

Let $b$ be the number of boys and $g$ be the number of girls. $$\frac23 b = \frac34 g \Rightarrow b = \frac98 g$$

For $g$ and $b$ to be integers, $g$ must cancel out with the denominator, and the smallest possible value is $8$. This yields $9$ boys. The minimum number of students is $8+9=\boxed{\textbf{(B)}\ 17}$.

## Solution 2

We know that $\frac23 B = \frac34 G$ or $\frac69 B = \frac68 G$. So, the ratio of the number of boys to girls is 9:8. The smallest total number of students is $9 + 8 = \boxed{\textbf{(B)}\ 17}$. ~DY

## Video Solution by WhyMath

~savannahsolver

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