A ladder that is leaned against a building 20 feet from the base reaches up 48 feet on the side of the building, how long is the ladder??

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?