[goatforce5]

It's a totally reasonable question. If you were working for the same person and you signed a contract that obliged the company to do/purchase something and there was un undefined number in there, you'd probably find yourself fired.

"The service level agreement says if something goes wrong we'll get 50% of their staff working on it."

"How many staff do they have?"

"I dunno, but 50% of it sounds like a lot!"

Ask them if they want employees who would sign contracts which lack key bits of information.