What has a ring but no finger?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99