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Difficulty: Sub 505 Level,   Arithmetic,                        
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Re: In the figure above, the sum of the three numbers in the hor [#permalink]
Attachment:
untitled.PNG
untitled.PNG [ 5.94 KiB | Viewed 18156 times ]

In the figure above, the sum of the three numbers in the horizontal row equals the product of the three numbers in the vertical column . What is the value of xy ?

(A) 6
(B) 15
(C) 35
(D) 75
(E) 90


Sol: Given that sum of Horizontal numbers (37+38+15=90)= Product of 15*x*y
So the product of xy= 90/15 =6
Ans A
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Re: In the figure above, the sum of the three numbers in the hor [#permalink]
This question can also be done just by looking at unit digits. Unit Digit of horizontal is 0 (7+5+8). Vertical is 15xy. So, the unit digit of xy when multiplied with 5 should give a 0. Only possible option is 6. Rest all options give a 5 as unit digit.

Answer choice: A
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Re: In the figure above, the sum of the three numbers in the hor [#permalink]
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

Attachment:
Untitled.png
In the figure above, the sum of the three numbers in the horizontal row equals the product of the three numbers in the vertical column . What is the value of xy ?

(A) 6
(B) 15
(C) 35
(D) 75
(E) 90

Problem Solving
Question: 19
Category: Arithmetic Operations on rational numbers
Page: 64
Difficulty: 550


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37 + 38 + 15 = 15xy
90 = 15xy
xy =6

IMO A
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Re: In the figure above, the sum of the three numbers in the hor [#permalink]
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