A group of friends met at a club 15 days ago and promised to meet again after 36 days. If today is Saturday, on which day will the friends meet again?

Correct option is B

Given:
A group of friends met at a club 15 days ago and promise to meet again after 36 days.
Today is Saturday it means today is 16 day after they met last time.
Solution:
We have to find the 36th day of the meet again.
After meet day - The day that have passed
⇒ 36 - 15 =  21
Here, 21 days are left to meet again.
⇒ 21 ÷ 7 = 3 (Odd day 0)
It means if today is Saturday so, after 21 days is also a Saturday.
Hence, the correct answer is  "Saturday".