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21 Jan 2019, 01:10
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
77% (01:28) correct
23%
(01:31)
wrong
based on 99
sessions
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Time
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Not Attempted Yet
A group of marbles is arranged into x rows and y columns. If the number of columns is 7 times the number of rows, and there are 343 total marbles, how many rows are there?
A 7
B 14
C 49
D 62
E 74
A 7
B 14
C 49
D 62
E 74
Chethan92
Joined: 18 Jul 2018
Last visit: 21 Apr 2022
Posts: 901
Own Kudos:
Given Kudos: 95
Location: India
Concentration: Operations, General Management
Schools: IIMB EPGP'22 (M)
GMAT 1: 590 Q46 V25
GMAT 2: 690 Q49 V34
WE:Engineering (Energy)
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21 Jan 2019, 01:23
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y = 7x
Also, xy = 343
\(7x^2 = 343\)
\(x^2 = 49\)
x = +7 or -7
As x cannot be negative, x = +7
y = 49
No. of rows, x = 7.
A is the answer.
Also, xy = 343
\(7x^2 = 343\)
\(x^2 = 49\)
x = +7 or -7
As x cannot be negative, x = +7
y = 49
No. of rows, x = 7.
A is the answer.
21 Jan 2019, 03:05
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Bunuel
Total number of marbles = No of rows * No. of columns
343 = No of rows * 7 * No of rows (Since No of columns = 7 * No of rows)
We know that 343 = 7^3 so "No of rows" must be 7.
Answer (A)
