To find out how many cups of almonds Luis needs for 3 cups of chocolate chips, we can set up a proportion based on the recipe.
The ratio of almonds to chocolate chips is: \[ \frac{18 \text{ cups of almonds}}{34 \text{ cups of chocolate chips}} \]
Now, let \( x \) be the number of cups of almonds needed for 3 cups of chocolate chips: \[ \frac{18 \text{ cups of almonds}}{34 \text{ cups of chocolate chips}} = \frac{x \text{ cups of almonds}}{3 \text{ cups of chocolate chips}} \]
Next, we can cross-multiply to solve for \( x \): \[ 18 \cdot 3 = 34 \cdot x \] \[ 54 = 34x \] \[ x = \frac{54}{34} \] \[ x \approx 1.5882 \]
Now we round to the nearest tenth: \[ x \approx 1.6 \]
None of the given options fit this answer, suggesting a recheck of calculations or assumptions may be needed. However, under the data initially provided, our answer here stands as \( \approx 1.6 \).
For completion, the answer obtained does indeed not coincide with options; please verify the problem or values given.