What four weights can be used to balance from 1 to 30 pounds?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

What do you call a fish without an eye?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

There are forty elephants and they have forty-fore heads. How can this be possible?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

John was piloting a plane behind a car but was never able to overtake it. Why?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?