"How are you? And how are you?"

Translation: तुम कैसे हो? और तुम कैसी हो?

[AndriLindbergs]

I wrote आप कैसे हैं? और तुम कैसी हो? the first being formal and latter casual. It was rejected! I imagined a scenario where you would greet a grandfather and his grandchild.

[AndriLindbergs]

This time around I tried to have both sentences in the formal address आप कैसे हैं? और आप कैसे हैं? and I was corrected with आप कैसे हो? और आप कैसे हो which confused me completely.
I had learned (long ago) that when you use the formal आप you end it with the formal हैं, and vice versa, if you use तुम it becomes हो. But I have never seen the combination where आप has the ending of हो.
It can either be आप कैसे हैं? or तुम कैसे हो?, not mixed, right?

[Zesul]

There are actually (at least) 36 ways of translating the sentence.

[AndriLindbergs]

Thanks for doing the math :)

[i123iu]

Why is the first question कैसे and the second कैसी. Why aren't they the same

[Naxray]

It doesnt matter which one you use because there is nothing showing gender in this sentence

[Prajisha3]

Exactly

[paul376479]

I simply put कैसे हो और कैसी हो because in my experience in India (I am Australian) talking to local people, this was acceptable (not using TUM at the beginning). I got marked wrong.