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?

solution:

let x be his daughter age in last year,

______-______=______

*please have 解釋!!

*the first step must be______-______=______

1 Answer

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  • 1 decade ago
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    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,

    3x=x+26

    2x=26

    x=13

    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)

    =39+1

    =40

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