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题库 / Prep2007E1-DS-18
What is the hundredths digit of the decimal z ?
(1) The tenths digit of 100z is 2.
(2) The units digit of 1,000z is 2.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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Let's say z=a.bcd The hundredths digit of z would be the value of c
So the question is c=?
(1) 100z=100∗a.bcd=abc.d --> the tenths digit of 100z
100z is the value of d ,Not sufficient to calculate c
(2) 1000z=1000∗a.bcd=abcd --> the units digit of 1000z is the value of d ,Not sufficient to calculate c
分数的百位是小数点后第二位
tens digit/tenths digit