72kg in a ratio of 1:3:5

The answer is 8:24:40 ... 1+3+8=9 72/9=8 and than 1*8=8, 3*8=24, 5*8=40

first of all you add all of the ratios together so it would be 1+3+5 That equals 9 then divide 72 by 9 which gets you 8. Then you times 8 by all of the ratios to get the answer 8:24:40