To find out how many cups of almonds Luis will need when he uses 3 cups of chocolate chips, we can set up a proportion based on the original recipe.
The given ratio of almonds to chocolate chips is:
\[ \frac{1.8 \text{ cups of almonds}}{3.4 \text{ cups of chocolate chips}} \]
We can express this as: \[ \frac{1.8}{3.4} \]
Now, we want to find how many cups of almonds \( x \) are needed for 3 cups of chocolate chips:
\[ \frac{1.8}{3.4} = \frac{x}{3} \]
Now we can cross-multiply:
\[ 1.8 \times 3 = 3.4 \times x \]
This simplifies to:
\[ 5.4 = 3.4x \]
Now, to solve for \( x \), divide both sides by 3.4:
\[ x = \frac{5.4}{3.4} \approx 1.588 \]
Rounding this value to the nearest tenth gives us approximately 1.6 cups of almonds.
Therefore:
- The correct response is not included, which would be approximately 1.6 cups of almonds needed based on the calculation.