Need help with multiplying a whole number with a fraction

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

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

With alll of except for the 2 that i did already