Why is my brain not working that way?by :
The Mystery :
A child’s mystery in the office:
344 = 2
188 = 4
690 = three
501 is?
The work stood up...

Boring shit, here are the holes in the numbers and count. Eight of them are two.

Three hundred and forty four (2C)
One hundred and seventy eight (4C)
Six hundred nine hundred (3C)
and attention! Five hundred one (1 C)
What am I doing wrong?