Let the cost of a small crate of apples be \( x \) and the cost of a large crate of apples be \( y \).
From the information given, we can set up the following equations based on Danae's and Sonny's sales:
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For Danae: \[ 3x + 14y = 203 \]
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For Sonny: \[ 11x + 11y = 220 \]
We can simplify Sonny's equation by dividing everything by 11: \[ x + y = 20 \]
Now we have a system of equations:
- \( 3x + 14y = 203 \)
- \( x + y = 20 \)
We can solve for \( y \) in the second equation: \[ y = 20 - x \]
Now, we substitute \( y \) into the first equation: \[ 3x + 14(20 - x) = 203 \]
Expanding this gives: \[ 3x + 280 - 14x = 203 \]
Combining like terms: \[ -11x + 280 = 203 \]
Subtracting 280 from both sides: \[ -11x = 203 - 280 \] \[ -11x = -77 \]
Dividing by -11: \[ x = 7 \]
Now, we substitute \( x \) back into the equation for \( y \): \[ y = 20 - 7 = 13 \]
Thus, the cost of one small crate of apples is \( \boxed{7} \) dollars and the cost of one large crate of apples is \( \boxed{13} \) dollars.