Find the next number in the sequence

1, 2, 6, 21, 88, __?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

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

O T T F F S S ?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Can you make a six-letter word using the letters N, A and B ?

Which tank will fill first?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?