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Let the number be 5a and 5b, where a and be are two number prime to each other. 

∴ 5a x 5b = 180
∴ ab = 7.2
Now, the pairs of number whose products is 7.2, are (7.2, 1)

So, the required numbers are (5 x 1, 5 x 7.2).

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