Find the next number in the series below

21 32 54 87 131 ?

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

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

The answer I give is yes, but what I mean is no. What was the question?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.