Great!

As I read the instructions, it's supposed to give UPPERCASE responses. But if it works.

just wow !!!

I figured it out later. It was a silly mistake to not return anything and just console log it
Thanks for the help btw.

I understand, my English is very bad)

This means you returned 10 and should have returned 1:
Expected your answer to equal the correct answer

It means the opposite: You returned 10, it expected 1.

expected 10 to equal 1
Never?

Tests never expect 10. You must misinterpret something.

why does the test expect 10 if it needs a single digit?

It only requires basic math knowledge, so seemed pretty concise to me.
If you have a more intuitive one, you can add it here.

but no

n - 16 test - 3 How? Java

fixed