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Z = 231.abc What is the result when Z is rounded to the nearest integer? (1) When Z is rounded to the nearest tenth,

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Z = 231.abc What is the result when Z is rounded to the nearest integer? (1) When Z is rounded to the nearest tenth,

by BTGmoderatorDC » Fri Apr 10, 2020 4:25 pm

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Z = 231.abc

What is the result when Z is rounded to the nearest integer?

(1) When Z is rounded to the nearest tenth, the result is 231.5

(2) When Z is rounded to the nearest hundredth, the result is 231.46


OA B

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Re: Z = 231.abc What is the result when Z is rounded to the nearest integer? (1) When Z is rounded to the nearest tent

by Jay@ManhattanReview » Sun Apr 12, 2020 10:16 pm

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BTGmoderatorDC wrote: ↑
Fri Apr 10, 2020 4:25 pm
 Z = 231.abc

What is the result when Z is rounded to the nearest integer?

(1) When Z is rounded to the nearest tenth, the result is 231.5.

(2) When Z is rounded to the nearest hundredth, the result is 231.46.

OA B

Source: e-GMAT
Let's take each statement one by one.

(1) When Z is rounded to the nearest tenth, the result is 231.5

Case 1: Say a < 5. For example Z = 231.478. Z = 231.
Case 2: Say a = 5. For example Z = 231.538. Z = 232.

No unique answer. Insufficient.

(2) When Z is rounded to the nearest hundredth, the result is 231.46.

Value of a is fixed, which is less than 5; thus, Z = 231. Sufficient.

The correct answer: B

Hope this helps!

-Jay
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