A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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

The more it dries, the wetter it becomes. Can you tell what it is?

I have an eye but still cannot see.

Who am I?

What can go through glass without breaking it?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

81 x 9 = 801. What must you do to make the this equation true?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?