Fiberglass hood and hinges

If your hood weighs 28 lb and is about four feet long, the push required to hold it up with a lever arm of four inches (1/3 of a foot) is about 12 times 28,, divide by 2 since all the weight is not at the front, divided by 2 for each strut, or 84 lb each... does that sound like it's in the ballpark?