State whether the following statement is True or False
A number is divisible by 18, if it is divisible by both 3 and 6.
If a number is divisible by 9 and 10 both, then it must be divisible by 90.
If a number is divisible by 3, it must be divisible by 9
If a number is divisible by 3 numbers, it must be divisible by their sum.