There is this number which is less than 100.
1) Divide by 3 get remainder 1
2) Divide by 4 get remainder 2
3) Divide by 5 get remainder 3
4) Divide by 6 get remainder 4
What is this number?
This number i still haven't solved out...saw this problem on some blog, got a shock that it is asked in a primary 5 exam! what the... so 可怜...
Wednesday, August 22, 2007
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4 comments:
58?
ya 58 is correct! clap clap clap...
tell us how u did it...cuz i am finding a super short method...currently i am stuck with 3 steps...
do we have to use like mathematical expressions to solve this?
I just cross out all the "impossible" numbers..
from (2) and (4): the number is even
from (3): it’s 8 or 18 or 28 or ... or 98
from (1): 28 or 58 or 88
but 28 & 88 is divisible by 4, so it’s 58..
is there a mathematically more correct way?
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