A teaspoon holds 5ml. What decimal fraction of a liter is contained in 100 spoonfuls?
100 spoonfuls would contain 100 x 5ml = 500ml.
To convert this to liters, we divide by 1000 (since there are 1000ml in a liter):
500ml / 1000 = 0.5
Therefore, 100 spoonfuls contains 0.5 liters.