5楼不二周助
(学习Nativity Ode)
发表于 2007-10-5 09:49
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回复 4#dayan888 的帖子
答案正确,谢谢翻译!我来用英语把做的过程说一遍。
The way to figure this out is to start at the end with 39 petals. and remember that the primroses must provide either 5 petals or 10 or 15 or 20 or 30-a multiple of 5. Now suppose there was only one celandine (8 petals); that would leave 31 petals (39-8=31). The rest can't be primroses, because 31 is not an exact multiple of 5. Suppose there were two celandines; that would make 16 petals, leaving 23. No good! Three celandines=24 petals, and 39-24=15 petals. Bingo! The answer must be 3 celandines and 3 primroses. Check: 3x8=24 and 3x5=15, and 24+15=39. So Rose is (3+3), or 6.
Is this clear enough?
又学英语又学数学。.