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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

Through your logical capabilities, can you make 7 an even?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

What can you hold in your right hand, but never in your left hand?

Can you name some countries which do not have the alphabet 'A' in them?

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?

I add 5 to 9 and get 2. The answer is correct, so what am I?