What sequence begins with the number five and then adds five each time?

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

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth

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