f.2 maths
2007-04-10 8:08 pm
In a lake,there is a patch of lilies. The patch doubles its size everyday.It takes 48 days to cover the lake. How long does it take to cover half of the lake?
回答 (3)
2007-04-10 8:15 pm
✔ 最佳答案
since the patch doubles its size everydaytotal time needed = 48days
before the last double , the patch cover half of the lake
ie. it takes 47 days to cover half of the lake
2007-04-10 9:25 pm
47days
Since the patch doubles its size everyday,
47th day is half size of 48th day,
i.e. half of the lake.
Since the patch doubles its size everyday,
47th day is half size of 48th day,
i.e. half of the lake.
2007-04-10 8:16 pm
Answers = 47 days
it is becauce the patch double its size each day
it cover the lake with 48 days
let 2x be the size of lake
half of the lake = 1x
it is becauce the patch double its size each day
it cover the lake with 48 days
let 2x be the size of lake
half of the lake = 1x
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