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Anonymous
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One fifth in decimal ways would be .2 or .20
one fifth=20%20% = 20/100 = 2/10 = 1/5
2/5 + 2/48/20 + 10/20 = 18/20 = 9/10
It means: 1/2 times 1/5 times 20 = 2
1/5 = 2/10 = 0.2 = 20%