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

18 ? 12 ? 4 ? 5 = 59

Find the next number in the sequence

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

I know a nine-letter word having only one vowel.
Do you ?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Which English verb becomes past tense just by rearranging the letters?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Can you place three balls such that the equation shown in the picture holds true?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?