Iam greater the 4 tens and less then 5 tens. i have 9 ones what am i ?

49...

Think of four 10's as
40

And five 10's as
50

It states that you have 9 ones so add to 40
or subtract from 50

49 is more than 40
49>40
and is less than 50
49<50

Good Luck future questions :)

The correct answer is -20y