The combined ages of Frasier and Niles is 88 years; the combined ages of Niles and Daphne is 76 years; the combined ages of Frasier and Daphne is 80 years. Then, how old is Frasier?
46 years old．
设Frasier的年龄为X，Niles的年龄为Y，Daphne的年龄为Z；故可得出方程式如 下：X+Y=88，Y+Z=76，X+Z=80；求解可得出X=46。