There are an infinite number of them.
One of them is 2/5 .
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18/45 is equivalent to 2/5 in its simplest form
18/40 = 9/20 = .45
5 times 9 is 45. 2 times 9 is 18 so the equivalent fraction is 18/45
18 over 30 27 over 45 36 over 60
you could do 45 multiplied by 2 and nine multiplied by 2 so your answer should be 18/90