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Anonymous
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6/10, 9/15, 30/50
50% of 6 is 3, so to decrease 6 by 50% you subtract 3 from 6 and you are left with 3.
3/10, 6/20
50% 30/60 = 3/6 = 1/2 = 10/20 = 50/100
3/6 x 100% = 50% Therefore, 3 out of 6 equals 50%.