Yahoo Answers: Answers and Comments for Complicated math problem for other purposes? [Mathematics]
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From Anonymous
enUS
Sat, 21 Nov 2009 13:51:29 +0000
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Yahoo Answers: Answers and Comments for Complicated math problem for other purposes? [Mathematics]
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From Kwis: 1. percent left on earth
2. what percent died...
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Sat, 21 Nov 2009 22:01:26 +0000
1. percent left on earth
2. what percent died
3. 1 in how many die
1. the percent that are still alive is 2/7 = 28.8%
2. the percent that died would be 5 billion divided by 7 billion...so about 71.4%
3. it's not really 1 in something...it's 5 in 7 would die....or you could say something like 1 in 1.4 people would die.

From George: First question: % left on earth. 2 billion d...
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Sat, 21 Nov 2009 22:12:18 +0000
First question: % left on earth. 2 billion divided by 7 billion = 2/7 = .2857 = 28.57%.
Second question: % died. 5 billion died out of 7 billion = 5/7 = .7143 = 71.43%. You could also subtract 28.57% from 100% to get 71.43%.
If 5 out of 7 died, then set up a ratio: 5/7 = 1/X where X is the answer. Cross multiply to get:
5X = 7. X = 7/5 = 1.4. 1 out of 1.4 people died.

From Anonymous: ok, lets start with 1 in how many people died....
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Sat, 21 Nov 2009 22:12:00 +0000
ok, lets start with 1 in how many people died.
2/7 of the origional population remain, so 5/7 died. this means 1/(7/5), or 1/1.4 people died
the percent of people left is the same as 2/7*100 = about 28.57% of people remain
if 28.57% people remain, then the total (100%)  the remaining people (28.57%) is how many people died. 100  28.57 = 71.43% of people died

From Colorapathy: To figure out what percentage, there is a simp...
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Sat, 21 Nov 2009 22:11:04 +0000
To figure out what percentage, there is a simple equation:
(part/whole)=(percent/100)
The part is 2 billion (or the part of the original number that is left) and the whole is 7 billion. This would end up being written like:
2,000,000,000/7,000,000,000=x/100
You would then cross multiply, giving you:
2,000,000,000(100)=7,000,000,000x multiply 2 billion times 100
200,000,000,000=7,000,000,000x divide by 7 billion
x = 28.5714, or 29 % rounded up.
29% are left, to get the amount that died, just subtract 29 from 100. 10029 = 71%
To find 1 in how many people died, first subtract 2 billion from 7 billion to figure out how many people died. This gives you 5 billion. Then take 5 billion and set it over 7 billion in a fraction and reduce.
This gives you 1 out of every 1.4 people that died. Most statistics aren't written that way, so they would probably say that either: 1 out of every 2 people died, or more accurately, 5 out of every 7 people died.
So:
29% of the population is still living
71% of the population was killed
5 out of every 7 people died

From billrussell42: left: 2/7 = 0.29 = 29%
died: 5/7 = 0.71 = 71...
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Sat, 21 Nov 2009 22:08:23 +0000
left: 2/7 = 0.29 = 29%
died: 5/7 = 0.71 = 71%
5/ 7 die or 1 out of 1.4
.

From dophse: if you want the percentage from 7 million popu...
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Sat, 21 Nov 2009 22:04:40 +0000
if you want the percentage from 7 million population
percentage of people alive (2/7) *100
and people died (5/7) * 100
second part
out of 7 million 5 million died
in other word
5 people in in every 7 died

From SkimmerDewd11: percent... divide 2/7 *100 = 28.5% left. 100...
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Sat, 21 Nov 2009 22:04:32 +0000
percent... divide 2/7 *100 = 28.5% left. 10028.5=71.5% died. Idk the 1 in how many part.. lol.

From Ramon: percent would be left on earth =(2/7)100=28.6%...
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Sat, 21 Nov 2009 22:03:07 +0000
percent would be left on earth =(2/7)100=28.6%
percent would have died =(5/7)100=71.4
die ( 5 of 7) so
1 in 1.4 people would die

From Anonymous: About 70 percent died which leaves 30 percent ...
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Sat, 21 Nov 2009 22:02:18 +0000
About 70 percent died which leaves 30 percent who lived. I think that 1 in 3 would have died. Not good with ratios or percents though :(