Can anyone work this one out?

This was on the Tickle IQ test. I couldn't work it out.

John likes 400 but not 300; he likes 100 but not 99; he likes 3600 but not 3700. Which does he like?

a} 900
b} 1000
c} 1100
d} 1200

He likes 900.

-Ray.

Originally posted by rgoudie
He likes 900.

-Ray.

Yep, 'cause he only like squares.

Originally posted by bbarr
Yep, 'cause he only like squares.

This is why I felt qualified to respond.

-Ray.

squares, squares, squares!!!!

Originally posted by dmitch87
squares, squares, squares!!!!

John is a square too!

I had a tough time with that, and guessed.

P-

This might sound stupid but I still don't get it. What do you mean by squares exactly?

Originally posted by stoffer
This might sound stupid but I still don't get it. What do you mean by squares exactly?

In loose terms, a square integer is an integer that may be expressed as the square of another integer.

For example, 900 is a square because it is equal to 30 times 30.

-Ray.