perfect square numbers are 16 and 25
28 is a perfect number.
The two perfect numbers between 1 and 30 are: 6, 28
20 is between 10 and 30.
The number is 28.
30
36
-10
It is 28 I did that at school in year 6
25 is a perfect square occurring between 20 and 30.
-20
30
It is: 11