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The mother is 53 years old, her son is 38 years old. How many years ago was the ratio of their age 3:2 respectively?

Mathematics

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Answer

miaka 8\text{miaka 8}

Step-by-step solution

4 steps
  1. Andika umri wa sasa na uweke xx kama idadi ya miaka iliyopita.

    Umri wa mama sasa ni miaka 53.
    Umri wa mwana sasa ni miaka 38.
    Tuseme xx ni idadi ya miaka iliyopita.
    Umri wa mama miaka xx iliyopita ulikuwa 53−x53 - x.
    Umri wa mwana miaka xx iliyopita ulikuwa 38−x38 - x.
    Uwiano wa umri wao miaka xx iliyopita ulikuwa 3:23:2.

  2. Unda mlinganyo kwa kutumia uwiano wa umri.

    53−x38−x=32\frac{53 - x}{38 - x} = \frac{3}{2}
  3. Fanya kuzidisha mtambuka ili kutatua mlinganyo.

    2(53−x)=3(38−x)2(53 - x) = 3(38 - x) 106−2x=114−3x106 - 2x = 114 - 3x
  4. Panga upya mlinganyo ili kupata thamani ya xx.

    Ongeza 3x3x pande zote mbili:

    106−2x+3x=114106 - 2x + 3x = 114 106+x=114106 + x = 114

    Toa 106 pande zote mbili:

    x=114−106x = 114 - 106 x=8x = 8

    Miaka 8 iliyopita, umri wa mama ulikuwa 53−8=4553 - 8 = 45 na umri wa mwana ulikuwa 38−8=3038 - 8 = 30. Uwiano wa umri wao ulikuwa 4530=32\frac{45}{30} = \frac{3}{2}.

    Jibu la mwisho ni:
    Miaka iliyopita ilikuwa miaka 8\text{miaka 8}.

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