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psychologist

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Manager
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psychologist [#permalink]

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New post 14 Dec 2007, 09:00
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4. A certain psychologist charges $30 more for the first hour of therapy than for each additional hour. If the total charge to a patient who receives 6 hours of therapy is $300, what is the total charge to a patient who receives only 3 hours of therapy ?
(A) $120
(B) $135
(C) $150
(D) $165
(E) $192
Director
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 [#permalink]

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New post 14 Dec 2007, 09:04
6x + 30 = 300
6x = 270
x = $45

3(45) + 30 = $165

Answer D
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Re: psychologist [#permalink]

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New post 14 Dec 2007, 11:29
smily_buddy wrote:
4. A certain psychologist charges $30 more for the first hour of therapy than for each additional hour. If the total charge to a patient who receives 6 hours of therapy is $300, what is the total charge to a patient who receives only 3 hours of therapy ?
(A) $120
(B) $135
(C) $150
(D) $165
(E) $192


x+30 + 5x =300 (its 5x b/c we already have one hour in x+30)

x=45

x+30 +2x=? 75+90=165

D.

def. avoid the "obvious" answer of C here.
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Re: psychologist [#permalink]

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New post 14 Dec 2007, 12:20
smily_buddy wrote:
4. A certain psychologist charges $30 more for the first hour of therapy than for each additional hour. If the total charge to a patient who receives 6 hours of therapy is $300, what is the total charge to a patient who receives only 3 hours of therapy ?
(A) $120
(B) $135
(C) $150
(D) $165
(E) $192


300 = (30+x) + 5x
x = 45

for 3 hours: (30+x) + 2x = 75+90 = 165
Re: psychologist   [#permalink] 14 Dec 2007, 12:20
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