Answer:
54
Step-by-step explanation:
multiply 60 by 0.9 and you get 54..?
60/10
60


^ Pretend thats not a root, pretend its the normal sign you were to do when dividing, i have attached a picture on what it should look like.
6 and 8 go into 6 and 8 once. 6 goes into 12 2 times.