Answer :
Long explination short
Add 3+5=8, 8 becomes the lowest multiple
divide 72 by 8 =9
now multiply your ratio by this number
9(3:5)This equals to two groups
Group1 Has 3*9=27
Group 2 Has 5*9=45
27+45=72
Long explination short
Add 3+5=8, 8 becomes the lowest multiple
divide 72 by 8 =9
now multiply your ratio by this number
9(3:5)This equals to two groups
Group1 Has 3*9=27
Group 2 Has 5*9=45
27+45=72