It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Can you find out the total number of triangles in the given figure?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

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

How many letters are in the alphabet?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?