With what? There is no question
Answer: x = 0.3
Step-by-step explanation:
12x-18=-15+6x
6x = 3
x = 1/2 or 0.5
[Corrected]
If 30% of his collection is 12 cars, then we can use the fraction
30/12=100/x
x=40
Sorry but that's an unclear question, can you double check to see if you included everything, and also check to see the possible answers?
