well, half of 40 is 20.
20 divided by 2 = 10
and
40 divided by 2 = 20 so now you have 10 over 20.
then: 10 dived by 2 = 5
and 20 dived by 2 = 10
so now you have 5 over 10, and 5 is half of 10 so it is 1 over 2.
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20/50 = 40%
20% first day, 40% second day, Total percent of rain over the two days is (20+40)/2 = 30% per day
40 - 20 percent = 820% of 40= 20% * 40= 20%/100% * 40= 8
20 percent of 40 = 0.2 * 40 = 8
40% of 20 is 8%...