Yatsu asked in 科學及數學數學 · 1 decade ago

f.1 maths

Last year,mr.Lee was three times as old as his daughter and 26 years older than her.How old is mr.Lee now?


let x be his daughter age in last year,


*please have 解釋!!

*the first step must be______-______=______

1 Answer

  • 1 decade ago
    Favorite Answer

    x= Mr.Lee's daughter's age last year

    y= Mr.Lee's age last year

    Last year,

    3x=y.........eq1 ( 3 times as old as his daughter)

    y=x+26......eq2 (26years older than her)

    Sub eq1 into eq2,




    Mr.Lee's age now

    =3*13+1 ( 3 times as old as his daughter and add one more year for his age this year)



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