Answer:
6
Step-by-step explanation:

Multiply all 4 by each other.
Answer:
18:24 or simplest form is 3:4
Step-by-step explanation: If you don't need to simplify then it is 18:24, but if you simplify it by dividing 18 and 24 by 6, then the answer is 3:4 :)
The answer is the third one. which is:
He made a computation error when he added 10.35+7.6