GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Let x be a two-digit number. If the sum of the digits of x is 9, then
[#permalink]
14 Jan 2022, 03:06
14 Jan 2022, 03:06
Expert Reply
1
Bookmarks
00:00
Question Stats:
16% (00:43) correct
83% (02:03) wrong based on 6 sessions
Hide Show timer Statistics
Let x be a two-digit number. If the sum of the digits of x is 9, then the sum of the digits of the number (x + 10) is
(A) 1
(B) 8
(C) 10
(D) either 8 or 10
(E) either 1 or 10
(A) 1
(B) 8
(C) 10
(D) either 8 or 10
(E) either 1 or 10
Re: Let x be a two-digit number. If the sum of the digits of x is 9, then
[#permalink]
14 Jan 2022, 03:50
14 Jan 2022, 03:50
1
Given,
This is the fastest approach you can use ( will come to your mind in a second or so after reading the question)
Sum of digits of x is 9. The two digit can be from {18, 27, ...., 90} = {2.9, 3.9, ... 10.9 }
Basically it is multiple of 9.
Now add 10 to each of these makes these {28, 37, . . . 100}
So all the sums will be 10 and for the 100 it will be 1.
The correct option is E. (10 or 1)
This is the fastest approach you can use ( will come to your mind in a second or so after reading the question)
Sum of digits of x is 9. The two digit can be from {18, 27, ...., 90} = {2.9, 3.9, ... 10.9 }
Basically it is multiple of 9.
Now add 10 to each of these makes these {28, 37, . . . 100}
So all the sums will be 10 and for the 100 it will be 1.
The correct option is E. (10 or 1)
gmatclubot
Re: Let x be a two-digit number. If the sum of the digits of x is 9, then [#permalink]
14 Jan 2022, 03:50
Moderators:
