Fill in the blank multiple field

I have a few FITB questions that have a weight of 5 (this cannot be changed). The problem is that some of them need to have two enties, eg:

We have _________ thermal oil supply trees and __________ thermal oil return trees.

I know I could create 2 questions on this one page, but, as you can't enter 2.5 as a weight I can't get both answers to have a total weight of 5. Also, it's not ideal them being seperate questions because, if you get one wrong and one right then I need that to be a 0 score.

Is there any way to create this fill in the blank question with two entries and a weight of 5?

Thanks in advance.

Jim