Answer:
Three numbers greater than 20 and have 9 as a factor are {27, 36 and 45}
Explanation:
The numbers greater then 20 are : { 21,22,23,24,......}
Now, the number should have 9 as its factor.
⇒ The number should be DIVISIBLE by 9.
Consider the number from the set { 21,22,23,24,......}
The first number which is greater than 20 and is divisible by 9 = 27
The second number which is greater than 20 and is divisible by 9 = 36
The third number which is greater than 20 and is divisible by 9 = 45
Hence, three numbers greatest than 20 that have 9 as a factor are
{ 27, 36 and 45}