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In the figure above, the sum of the three numbers in the hor

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New post 02 Jan 2014, 06:37
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The Official Guide For GMAT® Quantitative Review, 2ND Edition

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

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New post 02 Jan 2014, 06:37
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Re: In the figure above, the sum of the three numbers in the hor  [#permalink]

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New post 02 Jan 2014, 07:07
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Very Easy Question --
Sum of elements in a horizontal row == 90
In verticle column one element is 15.
Multiply of 15 * x * y = 90
xy = 6..

So Option A is the answer.
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New post 03 Jan 2014, 00:35
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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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New post 05 Jan 2014, 11:16
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New post 21 Jul 2017, 21:14
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] 21 Jul 2017, 21:14
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