Final answer:
To determine the total amount of water Mrs. Simon will use each week for her 12 plants, we multiply the amount each plant needs (250ml) by the number of plants, resulting in 3000ml. Then, convert milliliters to liters to find out that she requires 3 liters of water weekly.
Step-by-step explanation:
To find out how many liters of water Mrs. Simon will use on her plants each week, we start by identifying the amount of water one plant needs, which is 250ml. Knowing that she has 12 plants, we multiply the amount of water needed for one plant by the number of plants. Therefore, 250ml/plant × 12 plants = 3000ml in total per week.
Now, since we want to convert milliliters to liters, we use the conversion factor that one liter is equivalent to 1000 milliliters. So, to convert 3000ml into liters, we divide 3000ml by 1000ml/L:
3000ml ÷ 1000ml/L = 3L
Hence, Mrs. Simon will use a total of 3 liters of water each week to water her 12 plants.