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Math Expert
Joined: 02 Sep 2009
Posts: 44630
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A jumbo box of candies has 15 rows with 10 spaces for candies in each [#permalink]
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28 Dec 2017, 00:26
D
E
Question Stats:
93% (01:17) correct 7% (01:05) wrong based on 15 sessions
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Intern
Joined: 20 Nov 2017
Posts: 2
GPA: 3
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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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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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Intern
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A jumbo box of candies has 15 rows with 10 spaces for candies in each [#permalink]
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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
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28 Dec 2017, 14:36
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