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A group of 20 friends went out for lunch. Five of them spent $21 each

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A group of 20 friends went out for lunch. Five of them spent $21 each  [#permalink]

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New post 17 Oct 2018, 00:22
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A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

46% (02:25) correct 54% (02:25) wrong based on 36 sessions

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Re: A group of 20 friends went out for lunch. Five of them spent $21 each  [#permalink]

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New post 19 Oct 2018, 06:17
Bunuel wrote:
A group of 20 friends went out for lunch. Five of them spent $21 each and each of the rest spent $x less than the average of all of them. Is the value of the average amount spent by all the friends $12?

(1) x = 3
(2) The total amount spent by all the friends is $240.


Total Friends = 20
5 spent $21 each i.e. total spend of 5 friends = 5*21 = 105
If average of all 20 friends = a
Then, total spend of remaining 15 friends = 15*(a-x)

Total Spend of all 20 friends = 105+15(a-x)

For Average to be $12, total spend = 105+15(12-x) = 12*20

i.e. 12-x = 135/15 = 9

Question REPHRASED: Is x = 3?

Statement 1: x = 3

SUFFICIENT

Statement 2: The total amount spent by all the friends is $240.

i.e. Average = 240/20 = 12

SUFFICIENT

Answer: Option D
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Re: A group of 20 friends went out for lunch. Five of them spent $21 each   [#permalink] 19 Oct 2018, 06:17
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