An exclusive tourist charges tourists b dollars for the fir : GMAT Data Sufficiency (DS)
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# An exclusive tourist charges tourists b dollars for the fir

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An exclusive tourist charges tourists b dollars for the fir [#permalink]

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21 Mar 2013, 11:36
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35% (medium)

Question Stats:

78% (01:59) correct 22% (01:38) wrong based on 23 sessions

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An exclusive tourist resort charges tourists b dollars for the first night stay and charges a reduced rate of c dollars for every subsequent night of stay .How much does the tourist resort charge tourist for the first night stay?

1)Adam was charged 390 dollars for his 6 nights stay
2)The average( arithmetic mean) daily room rent for 3 nights' stay is 7/9 th times the rate for the first night stay .
[Reveal] Spoiler: OA
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Re: An exclusive tourist charges tourists b dollars for the fir [#permalink]

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21 Mar 2013, 11:59
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guerrero25 wrote:
An exclusive tourist resort charges tourists b dollars for the first night stay and charges a reduced rate of c dollars for every subsequent night of stay .How much does the tourist resort charge tourist for the first night stay?

1)Adam was charged 390 dollars for his 6 nights stay
2)The average( arithmetic mean) daily room rent for 3 nights' stay is 7/9 th times the rate for the first night stay .

$$b=?$$

1)b+5n=390
not sufficient
n=1 b=385 and so on...

2)
$$\frac{(b+2n)}{3}=\frac{7}{9}b$$

$$6n=4b$$

$$b=\frac{3}{2}n$$

not sufficient

1+2)
$$b+5n=390$$
$$b=\frac{3}{2}n$$

$$b=90, n=60$$
sufficient, C
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Re: An exclusive tourist charges tourists b dollars for the fir   [#permalink] 21 Mar 2013, 11:59
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