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# A demographic survey of 100 families in which two parents were presen

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Math Expert
Joined: 02 Sep 2009
Posts: 58320
A demographic survey of 100 families in which two parents were presen  [#permalink]

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01 Feb 2018, 00:44
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Difficulty:

15% (low)

Question Stats:

83% (01:25) correct 17% (01:31) wrong based on 60 sessions

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A demographic survey of 100 families in which two parents were present revealed that the average age, A, of the oldest child is 20 years less than 1/2 the sum of the ages of the two parents. If F represents the age of one parent and M the age of the other parent, then which of the following is equivalent to A ?

(A) (F + M - 20)/2

(B) (F + M)/2 + 20

(C) (F + M)/2 - 20

(D) F + M- 10

(E) F + M+ 10

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Joined: 02 Sep 2009
Posts: 58320
Re: A demographic survey of 100 families in which two parents were presen  [#permalink]

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01 Feb 2018, 00:45
Bunuel wrote:
A demographic survey of 100 families in which two parents were present revealed that the average age, A, of the oldest child is 20 years less than 1/2 the sum of the ages of the two parents. If F represents the age of one parent and M the age of the other parent, then which of the following is equivalent to A ?

(A) (F + M - 20)/2

(B) (F + M)/2 + 20

(C) (F + M)/2 + 20

(D) F + M- 10

(E) F + M+ 10

Check other Age Problems in our Speial Questions Directory.
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Re: A demographic survey of 100 families in which two parents were presen  [#permalink]

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01 Feb 2018, 01:20
1
Bunuel: The Options B & C are repeated I guess.

The answer according to me is (F+M)/2 -20.
Math Expert
Joined: 02 Sep 2009
Posts: 58320
Re: A demographic survey of 100 families in which two parents were presen  [#permalink]

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01 Feb 2018, 01:25
RLokesh wrote:
Bunuel: The Options B & C are repeated I guess.

The answer according to me is (F+M)/2 -20.

Thank you. Edited.
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Re: A demographic survey of 100 families in which two parents were presen  [#permalink]

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02 Feb 2018, 12:20
Bunuel wrote:
A demographic survey of 100 families in which two parents were present revealed that the average age, A, of the oldest child is 20 years less than 1/2 the sum of the ages of the two parents. If F represents the age of one parent and M the age of the other parent, then which of the following is equivalent to A ?

(A) (F + M - 20)/2

(B) (F + M)/2 + 20

(C) (F + M)/2 - 20

(D) F + M- 10

(E) F + M+ 10

We can create the following equation:

A = (1/2)(F + M) - 20 = (F + M)/2 - 20

Answer: C
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Re: A demographic survey of 100 families in which two parents were presen   [#permalink] 02 Feb 2018, 12:20
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# A demographic survey of 100 families in which two parents were presen

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