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06 Sep 2019, 04:34
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
75% (01:14) correct
25%
(01:56)
wrong
based on 8
sessions
History
Date
Time
Result
Not Attempted Yet
If x and y are positive integers (x > y), what is the units’ digit of (10x – 9y)^2 ?
A. 9.
B. 7.
C. 5.
D. 3.
E. 1.
A. 9.
B. 7.
C. 5.
D. 3.
E. 1.
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07 Sep 2019, 00:42
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Hi Bunuel,
the question is asking for the units digit of (10X - 9Y)^2. There are two interpretations possible with the given expression =>
1. 10 * X - 9 * Y - No possible solution
2. 10X - 9Y, in whicch X, Y are digits in 10X and 9Y respectively.
How do we interpret these correctly. Does GMAT always specify whether X is a variable getting multiplied or a digit?
Thanks in advance
Harsh
the question is asking for the units digit of (10X - 9Y)^2. There are two interpretations possible with the given expression =>
1. 10 * X - 9 * Y - No possible solution
2. 10X - 9Y, in whicch X, Y are digits in 10X and 9Y respectively.
How do we interpret these correctly. Does GMAT always specify whether X is a variable getting multiplied or a digit?
Thanks in advance
Harsh
07 Sep 2019, 01:26
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Hi Bunuel - Request you to please post an explanation to your answer? I tried solving the question and was able to arrive at the multiple answer choices.
