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Another Riddle

over 8 years

--- Not created by me. Found this in a book, and it is great.

> Connor has 17 accounts on epicmafia

> Kerry has 26

> Soda has 20

> Giga has 19

> Pranay has 31

Lucid has created a new rule. To be able to play in the main lobby. Each user has to have at least 21 accounts and at most 25.

Creating or deleting account takes a lot of money now.

Giga comes up with his virus that can help them. These 5 people will only help each other, and no one else.

The virus works in the following manner.

>You can enter names of 2 users in it

> it will attack the server such that,

>you have the option of increasing the number of accounts by 8, or reducing by 13.

Example

So if the virus is used once, and soda and connor put their name- and select the option of +8, they both end up with 25 and 27 accounts respectively.

The virus will stop working after 9 such attacks.

try and get the number of accounts within the limit for the entire team.

Note that, the virus can't work if only one user's name is put in. They do not have the option to pick any random user outside their team.


PS: those who have solved such riddles, do not ruin it for others.

over 8 years
Figured it out in 8 moves, is there a faster solution?
over 8 years
-13 to pranay
deletedover 8 years
happy halloween
deletedover 8 years
i rhink i hthe op he put soda instead of giga?? tht makes sense to me
over 8 years
Do i post the answer here?
I figured it out
over 8 years
Okay it sounds cool, I'll try solving it when I come back from uni.
over 8 years
@Schutzekatze ,
a) it's between those two values - it could be 21, 22, 23, 24 and 25
b) if you add 8 and reduce 13, you basically substract 5, so you change the number's even/odd status.

@Jaleb
I know this one, it has to be both.
over 8 years
Is it at most 2 users, or does it have to have both people in it?
over 8 years
blister solved it in 8 moves.
over 8 years
How come in the example they end up with 25 and 27 accounts with the +8 option? Why is the increment 5 for Soda and 7 for Connor?