76 |
奶奶的年龄。 如果她的年龄不是4的倍数，那么就应该在60和69之间。 如果她的年龄是3的倍数，那么就应该在50和59之间。 如果她的年龄不是6的倍数，那么就应该在70和79之间。 如果她的年龄是3的倍数，那么就应该在50和59之间。 -- so, if her age is a multiple of 3, that can only be 51,54,57, but non of these are multiples of 4, by 如果她的年龄不是4的倍数，那么就应该在60和69之间, but that is impossible. So, we know, her is is not a multiple of 3, neither a multiple of 6. And by 如果她的年龄不是6的倍数，那么就应该在70和79之间, her age is between 70 and 79. and by 如果她的年龄不是4的倍数，那么就应该在60和69之间, her age can only be 72 or 76. But 72 divides 6... |
| 欢迎光临 珍珠湾ART (http://zzwav.com/) | Powered by Discuz! X3 |