BTGmoderatorDC wrote: ↑Wed Apr 21, 2021 3:31 pm
What is the hundreds digit of integer n?
1) The tens digit of n/10 is 4
2) The thousands digit of 10n is 4
Target question: What is the hundreds digit of integer n?
Statement 1: The tens digit of n/10 is 4
Key concept: When a number is divided by 10, the hundreds digit of the original number becomes the tens digit of the new number.
Example: When we divide 5
432 by 10, the resulting number is 5
43.2.
So, if the tens digit of n/10 is 4, then
4 is the hundreds digit of n
Since we can answer the
target question with certainty, statement 1 is SUFFICIENT
Statement 2: The thousands digit of 10n is 4
Key concept: When a number is multiplied by 10, the hundreds digit of the original number becomes the thousands digit of the new number.
Example: When we multiply 5
432 by 10, the resulting number is 5
4320.
So, if the thousands digit of 10n is 4, then
4 is the hundreds digit of n
Since we can answer the
target question with certainty, statement 2 is SUFFICIENT
Answer: D
Cheers,
Brent
