Since it is 40% OF 45 you have the whole and percent so multiply 45 by 40 then divide by 100 you get 18
Because it is like having a unit of measurement that is set
lets say that in a certain country, one serving of bread is 1/2 of the standard loaf
and if you have 3 servings, you have 3/2 loaf so the bottom number tells you how many parts out of 1 whole you have
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