LM wrote:

What is the hundredths digit of the decimal z?

(1) The tenths digit is 100z is 2

(2) The units digit of 1,000z is 2

Target question: What is the hundredths digit of the decimal z? Statement 1: The tenths digit of 100z is 2 Notice what happens when we take a decimal like 0.123456 and multiply it by 100.

We get 12.

345 (the tenths digit is 3)

In the

original decimal, the 3 was in the thousandths place.

So, statement 1 tells us that the THOUSANDTHS digit of z is 2

Since we cannot answer the

target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: The unit digit of 1000z is 2 Notice what happens when we take a decimal like 0.123456 and multiply it by 1000.

We get 12

3.45 (the units digit is 3)

In the

original decimal, the 3 was in the thousandths place.

So, statement 2 tells us that the THOUSANDTHS digit of z is 2

Since we cannot answer the

target question with certainty, statement 2 is NOT SUFFICIENT

NOTE: Since statements 1 and 2 BOTH tell us the same thing (i.e., the THOUSANDTHS digit of z is 2), the combined statements are NOT SUFFICIENT

Answer:

Cheers,

Brent

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Brent Hanneson – GMATPrepNow.com

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