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puzzled math problem [复制链接]

发表于 2012-3-18 11:42 |显示全部楼层
此文章由 ygao 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 ygao 所有!转贴必须注明作者、出处和本声明,并保持内容完整
Peter's age is X years in the year x squared.
Which of these is the year of his birth?
(a) 1963
(b) 1980
(c) 1990
(d) 2025
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发表于 2012-3-18 11:58 |显示全部楼层
此文章由 patrickzhu 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 patrickzhu 所有!转贴必须注明作者、出处和本声明,并保持内容完整
This question means peters age squared equals the year of which he was born in. For example: if I was 12, the year I would be born in is 144. If someone was 10, the year they would be born is 100. Peters age x peters age = year he was born in.
This is what I think. Peters age should be 45, as 45 x 45= 2025. BUT, 2025 is right now, to find out the year of which he was born in, we'd have to minus 45 (his age) and the final answer is 1980.

发表于 2012-3-18 12:33 |显示全部楼层
此文章由 MyDreamhouse 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 MyDreamhouse 所有!转贴必须注明作者、出处和本声明,并保持内容完整
这是几年级的数学啊?

发表于 2012-3-18 14:05 |显示全部楼层
此文章由 ygao 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 ygao 所有!转贴必须注明作者、出处和本声明,并保持内容完整
Thanks very much. It's grade 6.

发表于 2012-3-20 09:03 |显示全部楼层

1980

此文章由 wo-ai-wo-jia 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 wo-ai-wo-jia 所有!转贴必须注明作者、出处和本声明,并保持内容完整
His age is 45.
Number with last digit as 3 cannot be a squared number, 1980, 1990 is not squared number either.

45*45=2025
2025-45=1980

[ 本帖最后由 wo-ai-wo-jia 于 2012-3-20 10:04 编辑 ]

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