A patch of algae on the surface of a pond doubled in size everyday. It took 30 days for the algae to cover the pond. How long did it take the algae to cover half of the pond?
wtf, how do i get that? :_: and like can you guys show me the steps so i know how to do it next time?! thnks x millions~
2007-09-10 13:12:23 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Its a trick, which you will realize as soon as you hear the answer.
The answer is that half the pond was covered one day before the whole pond was covered, because it doubles every day. So the answer is 29 days.
2007-09-10 13:17:35 · answer #1 · answered by rscanner 6 · 0⤊ 1⤋
Ok.. lisin of a patch of algae of a bond dubbles everyday and after 30 days the pond is coverd...then the anser would be
7 and a half days... because if it dubles EVERY day then it take 2X less time so do this
ok.... 30 divited by 2= 15 and 15 divided by 2= 7.5 witch means it would take 7 days and 12 hours witch is 7 days and a half.
i did this same problem last year.
HOPE THIS HELPS U UNDERSTAND!! =)
2007-09-10 20:25:57 · answer #2 · answered by Anonymous · 0⤊ 0⤋
easy. it says it doubles everyday, and it took 30 days for the whole thing! half that would be half the pond, which means it took 29 days!
have yourself a good day
2007-09-10 20:17:53 · answer #3 · answered by climberguy12 7 · 0⤊ 1⤋
im only a kid but
30 divided by 2 is 15 so 15 days for it to cover half the pond i guess
2007-09-10 20:18:12 · answer #4 · answered by Anonymous · 0⤊ 1⤋
29 days
2007-09-10 20:17:20 · answer #5 · answered by everymansmedium 2 · 0⤊ 2⤋