A pilot flies 0.81 of the way to her destination before she stops to refuel. What percentage of her trip is left?

To determine the percentage of the trip that remains after a pilot has flown 0.81 of the total distance, we can first find out how much of the trip she has left to travel.

Given that she has completed 0.81 of the trip, the remaining distance is calculated by subtracting this value from 1 (which represents the whole trip). So, the calculation would be:

1 - 0.81 = 0.19

This result indicates that 0.19, or 19%, of the trip is still to be completed.

Understanding percentages in this context can be crucial for flight planning and understanding fuel requirements. The answer of 19% is significant as it provides the pilot with a clear and concise understanding of the remaining distance compared to the total trip, ensuring she can plan her refueling and any further navigation efficiently.