Can you make a six-letter word using the letters N, A and B ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

How many times can you subtract the number two from the number fifty?

You bought me for dinner but never eat me. What am I?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Count the number of triangles in the below picture?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

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