Answer: ×/2 + 9 =
Step-by-step explanation: when a sentence needs to be visualized it is best to strat from the outside.
So if nine more than blah blah equals 21,
... +9 = 21
The lease common multiple of the set of numbers is 108.
108/4=27.
108/27=4.
108/12=9.
Answer to your question : 12(4+1)