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divide 18 cups of flour into two groups so the ratio is 4 to 5

Sagot :

If the ratio is 4:5, then we have 4 + 5 = 9 "parts" of the ratio. What we want to do is to divide 18 by 9 to find out how many cups are in such a "part":

18 / 9 = 2

So if we know that there are 2 cups in each "part", If we want to make the ratio 4:5, all we need to do is to multiply 4 by 2 and 5 by 2:

4 * 2 = 8
5 * 2 = 10

So from 18 cups we can make two groups of 8 and 10 cups to keep the ratio of 4:5.