Explanation: First, we should know that a hectoliter is a unit of capacity that is equal to 100 liters.
We are given that the bathtub holds 1 hectoliter of water. This means that the bathtub holds 100 liters of water. We are also given that 25 liters of water were drained from the bathtub. This means that: remaining amount of water = original amount - drained amount remaining amount of water = 100 - 25 remaining amount of water = 75 liters