Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I look at you, you look at me, I raise my right, you raise your left. What am I?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

You can see three almost identical images below. Can you spot the odd one out from them?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

What does does this rebus picture means ?