A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

What number should come in place of the question mark below?

They are three errirs in this question. Can you find them?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Can you find a number that lies one third of the distance between 1/3 and 2/3?

You need to arrange three 7 and mathematical symbols to form number 1?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

what one word does the below rebus identifies?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?