It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

What does this say?

XLR8

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

When can we add 2 to 11 and get 1 as the correct answer?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

James Bond is caught up in a mysterious scenario where the evil villain has him blindfolded. He somehow breaks through the handcuffs but is unable to get the blindfold off. Upon searching, he comes across a bow and 3 arrows. He can hear the villain speak, and thus tries to take a shot at him. He launches the first arrow, it misses the villain. He then launches the second arrow and it misses by a greater margin.

What is the probability that this third shot our James bond takes will be worse than the second shot?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?