The letter ‘n’.

The only days the Lion can say that he lied on the previous day are Mondays and Thursdays. The only days the Unicorn can say this, are Thursdays and Sundays. Therefore, the only day they both say that is on Thursday

If answer 1 would be correct, then answer 2 (“Answer A or B”) would also be correct. If answer 2 would be correct, then answer 3 (“Answer B or C”) would also be correct. This leads to the conclusion that if either answer 1 or answer 2 would be the correct answer, there are at least two correct answers. This contradicts with the statement that “there is only one correct answer to this question”. If answer 3 would be correct, then there are no contradictions. So the solution is: answer 3 .

If you take the first letter , rest become palindrome

2⁶ – 63 = 1  (2^6-63=1)

10km
Speed us 10km/h

Take a piece of fruit from the “apples and oranges” crate. If it’s an apple then you know that is the “apples” crate since ALL THE CRATES ARE LABLED INCORRECTLY. This means the crate marked “apples” must be “oranges” and the crate marked “oranges” must be “apples and oranges”.

Very large hands

the brilliant student wrote down:

“This.”

And handed in the paper.

By doing this, the student demonstrated that he understood that having your grade based on one exam is risky.
Plus, putting just one word on such an important exam and hoping the professor understands what he means is risky in and of itself!

The first equation (365g = 52s) can be approximated by
7g = s.

As before, the other two equations are
12g = m
g + s + m = 140.

The above system of 3 equations in 3 unknowns (g, s and m) can be simply solved as follows.
g + 7g + 12g = 140 or 20g = 140.
m = 12g = 12 × 140 / 20 = 84.

So, Grandpa is 84 years old.