rashedBhai wrote:
What is the tens digit of the three-digit positive integer n?
(1) The tens digit of (n+5) is 5.
(2) The tens digit of n is less than the tens digit of 10n
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Question: What is the tens digit of the three-digit positive integer n?Statement 1: The tens digit of (n+5) is 5.by adding 5 in any number the ten's digit may change (if unit digit is greater than 4) or may remain same (if unit digit of number is less than 5) hence, the ten's digit of n may be 5 or 4 based on unit digit
since we have multiple values hence
NOT SUFFICIENT
Statement 2: The tens digit of n is less than the tens digit of 10ni.e. ten's digit of n is less than the unit digit of n (because by multiplying 10 in the number, the unit digit of number shifts to the tens place of result)
NOT SUFFICIENT
Combining the two statementsten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 1 to 4
in every case, adding 5 in n will NOT change the ten's digit of number hence
ten's digit of n = 5
SUFFICIENT
Answer: Option C
wont the value of n be in range from 145-149 ; tens digit would be 4..