Answer: 1/9 of the bag
Explanation:
The amount of coal left is 1 /3 of a bag.
They plan to cook 3 meals with this quantity.
The fraction they will use for each meal can be found by the following formula:
= Amount of Coal left / Number of meals to be cooked
= 1 / 3 ÷ 3
= 1 / 3 * 1/3
= 1/9 of the bag