Cecily is swinging. The swing goes back and forth twice every five seconds. How many seconds does it take her to go back and forth one hundred times?
Twice every 5 seconds = once every 2.5 seconds.
100 * 2.5 = ?
250 seconds
To find out how many seconds it takes Cecily to go back and forth one hundred times, we need to determine the time she takes for each back and forth motion and then multiply it by the number of times.
Given that the swing goes back and forth twice every five seconds, we can calculate the time it takes for one back and forth motion. Since it goes back and forth twice, each back and forth motion takes 5 seconds / 2 = 2.5 seconds.
To find the total time for one hundred back and forth motions, we multiply the time for one back and forth motion by the number of times: 2.5 seconds/back and forth * 100 back and forth motions = 250 seconds.
Therefore, it takes Cecily 250 seconds to go back and forth one hundred times.