If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Find the missing letter in the last circle logically in the given below picture.

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

In a classic wine shop, the list of three most popular wines are:
- The cost of 1 French wine bottle: 500$
- The cost of 1 German wine bottle: 100$
- The cost of 20 Dutch wine bottles: 100$

John entered the wine shop and he needs to buy
- All three types of wine bottles.
- Needs to buy Dutch wine bottles in multiples of 20.
- Need to buy 100 wine bottles in total.

John has only 10000$. How many wine bottles of each type, John must buy?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

What am I?

What is at the end of a rainbow?

What's a single-digit number with no value?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.