Let the number of strawberries Charlotte eats be \( x \). Then, since Emily eats four times the amount that Charlotte eats, Emily eats \( 4x \).
Together, their total strawberries can be represented as:
\[ x + 4x = 60 \]
This simplifies to:
\[ 5x = 60 \]
Now, to find \( x \), divide both sides by 5:
\[ x = \frac{60}{5} = 12 \]
Thus, Charlotte eats \( 12 \) strawberries.