6s. 2 and 3 divide into all these numbers but six is the greatest number that all
Divide into and they all have one s at least.
38 meters long is the answer
I'm not sure what exactly you did wrong, but I agree with you that the sample size is too small, so the correct answer will probably be the fourth options. Hope that this gives you some confidence, and 'm sorry not to be able to help you any further...
