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Anonymous
2/4 of 20 is 10.
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10
5/20 + 8/20 = 13/20
7/20
2/5 + 2/48/20 + 10/20 = 18/20 = 9/10
First we convert them into a standard amount, which is twentieths. Then we can do the calculation.8/20 - 5/20 = 3/20