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z or 50

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z or 50 [#permalink] New post   21 Oct 2020, 10:10
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Quantity A
Quantity B
z
50



A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.

Source: 320 GRE Math Questions
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B
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Re: z or 50 [#permalink] New post   21 Oct 2020, 10:23
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Z=40(90-opposite angle)

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Re: z or 50 [#permalink] New post   21 Oct 2020, 13:51
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I know your explanation is really down to the business but maybe some words more '?

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Re: z or 50 [#permalink] New post   27 Oct 2020, 00:37
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Here, as per the supplementary angle rule (the sum of angles on a line is 180°) , we can find that the angles AOD and BOC are 90°.
Similarly, using the complementary angle rule (the sum of angles in a right angle is 90°), we can find that angle EOD is 40°.
Now, we can see that angle z is opposite to the angle EOD, hence z=40.
Implying that 50>z
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Re: z or 50 [#permalink]
27 Oct 2020, 00:37
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