Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

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?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

Which number comes next in the number series?

2, 9, 30, 93, ?