# Quick Puzzle | Time Limit: 30 Seconds

Found this puzzle on LinkedIn and I think it's a good mental exercise. Not at all difficult to crack, but should give you a good 30 seconds π

• 9 = 90
• 8 = 72
• 7 = 56
• 6 = 42
• 3 = ??
If you take more than 30 seconds to crack this, you've gotta be needing some brain exercise. Spend time on CE and keep your brain engaged!

## Replies

• Igneta D'Souza
12π
• Ankita Katdare
18 it should be. Or is this a problem that has multiple correct answers based on assumptions or not-enough-data.
• Manashree Thokal
12
• Anoop Kumar
12 π
x = x*(x+1)
• KSS Manian
5 = 30
4 = 20.
3 = 12.
2 = 6.
1 = 2.

(or)

6 = 42
3 = 18 Which one is right???
• Sandeep Taurean
12
• Shailaja Tiwari
Kaustubh Katdare
π

• 9 = 90
• 8 = 72
• 7 = 56
• 6 = 42
• 3 = ??
time taken<20sec
ans: 12
ans : 18 (time taken 9 seconds)

explanation-:

9 = 90
8 * 9 = 72
7 * 8 = 56
6 * 7 = 42
3 * 6 = 18
• Sanyam Khurana
12..

Took like just 2 sec π
• Anoop Kumar
What is logic for getting 18?
• Shailaja Tiwari
ianoop
What is logic for getting 18?
they must have done by this way :
• 9 = 90
• (8*9=72)
• 8 = 72
• ( 7*8=56)
• 7 = 56
• (6*7=42)
• 6 = 42
• (3*6=18)
• 3 = ??
• Anoop Kumar
Shailaja Tiwari
they must have done by this way :
• 9 = 90
• (8*9=72)
• 8 = 72
• ( 7*8=56)
• 7 = 56
• (6*7=42)
• 6 = 42
• (3*6=18)
• 3 = ??
Really this is logicπ¨ , where did 9=90 came fromβ and why 3 came in series after 6, while other numbers are just x-1.

Why not x = x*(x+1).
• Shailaja Tiwari
9=90 - as 8 is multiplied with its higher consecutive no. 9,similarly they must have added 9 with its higher consecutive no.10.
and don't know about the series problem ,others may not have noticed it
• Shailaja Tiwari
π¨
• Ajay Pandey
Right answer is 18 or 12 depends on ur logic.In objective exams, options must be either 12 or 18 not both.My answer is 12 bcos first match a pattern and then relation between consecutive options.
• Anoop Kumar
Ajay Pandey
Right answer is 18 or 12 depends on ur logic.In objective exams, options must be either 12 or 18 not both.My answer is 12 bcos first match a pattern and then relation between consecutive options.
Still not convinced, how some of us getting 18.
• Ajay Pandey
8*9=72
7*8=56
6*7=42
3*6=18
by wrong logic ......π right answer is 12
• sargam shukla
Kaustubh Katdare
Found this puzzle on LinkedIn and I think it's a good mental exercise. Not at all difficult to crack, but should give you a good 30 seconds π

• 9 = 90
• 8 = 72
• 7 = 56
• 6 = 42
• 3 = ??
If you take more than 30 seconds to crack this, you've gotta be needing some brain exercise. Spend time on CE and keep your brain engaged!
12
write a program to print a message without using printf function.
• Raj A
12
• Sarathkumar Chandrasekaran
12
12 or 18 based on our assumption....
But i think 12 suits the most....
Took <15 s.....
• jeshukb09
18
Kaustubh Katdare
Found this puzzle on LinkedIn and I think it's a good mental exercise. Not at all difficult to crack, but should give you a good 30 seconds π

• 9 = 90
• 8 = 72
• 7 = 56
• 6 = 42
• 3 = ??
If you take more than 30 seconds to crack this, you've gotta be needing some brain exercise. Spend time on CE and keep your brain engaged!
it should be 12
• vijay jangid
12
• Karthikeyan jaisankar
18π
• KenJackson
write a program to print a message without using printf function.
At first I thought you must have posted in the wrong thread. But now I think I see that you think the answer 18 is bad logic, a non sequitur, so you posted your own non sequitur to protest. Right?

BTW. The answer to your puzzle is trivial if using one of the many computer languages that don't have a printf function.
• pavani kumari
Kaustubh Katdare
Found this puzzle on LinkedIn and I think it's a good mental exercise. Not at all difficult to crack, but should give you a good 30 seconds π

• 9 = 90
• 8 = 72
• 7 = 56
• 6 = 42
• 3 = ??
If you take more than 30 seconds to crack this, you've gotta be needing some brain exercise. Spend time on CE and keep your brain engaged!
its 18
• Shashank Moghe
Well 18 (3-4 seconds). Also, if you (want to) intrapolate the series, the answer comes to 12. There seems to be a confusion as to which one is correct.

If it were up to me , I would justify 18 as the correct answer because of the way the question is presented. I was not "told to" intrapolate.
• Karthikeyan jaisankar
18!!! π
• ManojKiran Eda
12
• Satheesh S.S
a*(a+1) so 12

You are reading an archived discussion.

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