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The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred , how many years old will Fred be y years from now, in terms of y ?

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The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred , how many years old will Fred be y years from now, in terms of y ?

The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred , how many years old will Fred be y years from now, in terms of y ?

Re: The sum of the ages of Doris and Fred is y years. If Doris [#permalink]

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11 Jun 2014, 14:41

It can be easily solved using smart numbers Doris = D, Fred = F Let's say D = 24 than F is 12 less = 12 --> 24 + 12 = Y = 36; So in Y or 36 Years Fred will be 12 + 36 = 48 Plugin 36 for Y, in a right answer you schould get 48 --> D (3*36)/2-6 = 48
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Re: The sum of the ages of Doris and Fred is y years. If Doris [#permalink]

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28 Jun 2015, 16:23

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Re: The sum of the ages of Doris and Fred is y years. If Doris [#permalink]

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06 Jul 2016, 00:57

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The sum of the ages of Doris and Fred is y years. If Doris [#permalink]

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09 Dec 2016, 03:46

BrainLab wrote:

It can be easily solved using smart numbers Doris = D, Fred = F Let's say D = 24 than F is 12 less = 12 --> 24 + 12 = Y = 36; So in Y or 36 Years Fred will be 12 + 36 = 48 Plugin 36 for Y, in a right answer you schould get 48 --> D (3*36)/2-6 = 48

I tried this method and I am completely stumped.

3*36=108 2-6=-4

108/4=27 not 48.

Can somebody please explain what I am doing wrong?

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