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In the addition calculation above, the number X must be

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Math Expert
Joined: 02 Sep 2009
Posts: 58396

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01 Feb 2018, 00:17
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Difficulty:

15% (low)

Question Stats:

86% (01:35) correct 14% (01:37) wrong based on 44 sessions

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729
5X3
+ 9X1
_____
2,2X3

In the addition calculation above, the number X must be

(A) 0

(B) 2

(C) 3

(D) 7

(E) 9

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Re: In the addition calculation above, the number X must be  [#permalink]

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01 Feb 2018, 01:13
Bunuel wrote:
729
5X3
+ 9X1
_____
2,2X3

In the addition calculation above, the number X must be

(A) 0

(B) 2

(C) 3

(D) 7

(E) 9

Since the first row has a carry over of 1, 1+2+X+X = 1X
The reason for the sum to be 1X and not X is we need a carry over of 1 to get the final value of 22X3.

This is only possible when X=7 as 3 + 7 + 7 = 17.
In order to double check if we substitute 7 in place of X, we will have 729 + 573 + 971 which will give us a sum of 2273(Option D)
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Re: In the addition calculation above, the number X must be   [#permalink] 01 Feb 2018, 01:13
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