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Anonymous
one fifth of 45 is:1/5 x 45 = 45/5= 45 ÷ 5= 9
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45/9 = 5/1 or 5
45/5 = 9 exactly, so it is a whole number
-40
25/45 + 21/45 = 46/45 or 1 and 1/45
A whole number.