Answer:
B. 0.06 ounce
Explanation:
The mixture prepared by Chuck is enough for 14 plants.
If Chuck only used it, according to the recommended amount, for 12 plants, then only 12/14 parts of the 0.42 ounces of plant food were used and 2/14 parts still remain the watering can. The amount of plant food left, in ounces, is:
![F=0.42*(2)/(14)\\ F=0.06\ ounce](https://img.qammunity.org/2021/formulas/mathematics/high-school/moetwbohu9efvhmjkfwbtqtfaskie51d0x.png)
0.06 ounce is left in the watering can.