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28 divided by 5 = 5, r3
To divide 72 into two groups with a ratio of 3 to 5, first, add the parts of the ratio together: 3 + 5 = 8. Next, determine the value of each part by dividing 72 by 8, which gives you 9. Then, multiply each part of the ratio by this value: 3 × 9 = 27 and 5 × 9 = 45. Thus, the two groups are 27 and 45.
because multiplying is like grouping. so 2 x 5 is 2 groups of 5 added together. so 9 groups of 1/3 equals 3.
72/8 = 9 and 3*9 = 27 and 5*9 = 45
8,640 groups.