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Need to turn these numbers to degrees

french horn= 6
trumpet= 15
tube= 8
The band director in the previous problem decided that displaying the information in a circle graph would help him determine if his students were evenly distributed. Complete the chart by multiplying the fractional part representing each instrument by 360. (Recall that there are 360 degrees in a circle.) State each letter and the correct number of degrees.
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1 Answer

If you add up all the band members, you'll get a sum of 40. If you divide this figure into 360 degrees (the angle measure of a circle), you'll get a quotient of 9. Therefore, if you multiply the amount of members using each instrument by 9 you will get the angle measure that each instrument will take on the circle graph. 
French Horn = 6 * 9 = 54 degrees
Trumpet = 15 * 9 = 135 degrees
Tube = 8 * 9 = 72 degrees
Trombone = 11 * 9 = 99 degrees