Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

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

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What does this Rebus Picture mean?

What can you see in the middle of March and April that you can never see in any other month?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?