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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
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Difficulty:
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.
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.
(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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88% (01:17) correct 
