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A jumbo box of candies has 15 rows with 10 spaces for candies in each

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A jumbo box of candies has 15 rows with 10 spaces for candies in each [#permalink]

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New post 28 Dec 2017, 00:26
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C
D
E

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  35% (medium)

Question Stats:

88% (01:17) correct 13% (00:51) wrong based on 16 sessions

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A jumbo box of candies has 15 rows with 10 spaces for candies in each row, how many candies are in the box?

(1) There is an average (arithmetic mean) of 6 empty spaces in the first 8 rows.
(2) There is an average (arithmetic mean) of 9 empty spaces in the last 7 rows.

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Re: A jumbo box of candies has 15 rows with 10 spaces for candies in each [#permalink]

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New post 28 Dec 2017, 08:13
A jumbo box of candies has 15 rows with 10 spaces for candies in each row, how many candies are in the box?

(1) There is an average (arithmetic mean) of 6 empty spaces in the first 8 rows.
(2) There is an average (arithmetic mean) of 9 empty spaces in the last 7 rows.

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(1) - You don't know anything about the empty spaces of the remaining 7 rows. These rows could f.i. be completely filled, or completely empty - insufficient
(2) - Same as for statement (1) - insufficient

(1) + (2) = sufficient. Now you know exactly know how many empty spaces there are and therefore how many candles there are in the box.
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A jumbo box of candies has 15 rows with 10 spaces for candies in each [#permalink]

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New post 28 Dec 2017, 14:36
Answer is C and the count is 32 + 7 = 39


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A jumbo box of candies has 15 rows with 10 spaces for candies in each   [#permalink] 28 Dec 2017, 14:36
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