On tuesday donovan and $11 for 2 hours of babysitting on saturday he babysat for the same family he and $38.15 how many hours did it babysit on saturday

11/2=5.50
38.15/5.50=6.936 hours.
Hope this helped you out.

He babysat for 6.936 hours, basically 7 hours. 
To find out how much he gets hourly, you divide 11/2 and get 5.5. This means he gets $5.50 hourly. Then you divide 38.15/5.5 to get how many hours he worked, getting an answer of 6.9. Therefore, he worked 6.9 hours on Saturday

Yes you are right the correct answer is b