Webwork 13 Q5,6 Bug?

I've tried to do Q5 and I got the part a (the equation) correct but when I plug in the numbers for Part b it doesn't work.

Here's a printscreen of my problem:

I've also discussed with my group members and we all couldn't get Q6, although it seems correct.

Thanks.

For Q5 b) read the question again, read your answer again and then think hard. There's a little modification to make.

For Q5 c) it might be that the thing wants units.

For Q6 all I got to say is that as soon as people get a hammer every problem they have looks like a nail. Read the question again carefully.

Okay thanks :)