20
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There are 40 of them because 40/10 = 4
30
Two wholes can be represented as the fraction 2/1. This is because a whole is equivalent to 1, so two wholes would be 2. Therefore, the fraction equivalent to 2 wholes is 2/1.
2.9
2 wholes make an integer and not a fraction. However, it can be expressed in rational form as 2/1 which cannot be simplified.