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31 May 2023, 03:36
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E
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Difficulty:
15%
(low)
Question Stats:
78% (00:53) correct
22%
(01:06)
wrong
based on 89
sessions
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Time
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If the positive integer x is a multiple of 3 and the positive integer y is a multiple of 9, then xy must be a multiple of which of the following?
i) 3
ii) 9
iii) 27
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
i) 3
ii) 9
iii) 27
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
31 May 2023, 03:37
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E. Number properties
Since x is a multiple of 3, xy must be a multiple of 3. Likewise, since 9 is a multiple of y, xy must be a multiple of 9. Multiply them together and the number is 27 or a multiple thereof. Therefore, xy must be a multiple of 3, of 9 and of 27.
Since x is a multiple of 3, xy must be a multiple of 3. Likewise, since 9 is a multiple of y, xy must be a multiple of 9. Multiply them together and the number is 27 or a multiple thereof. Therefore, xy must be a multiple of 3, of 9 and of 27.
28 Jul 2024, 17:41
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