You can call a contractors office, floors as well as walls have to be built to standards, if you know what year your house was built a contractor can tell you how much load your floor will hold/sqft.
Think about it this way, would 8 adult men be able to stand in the same area of floor as you're going to have the 150? just make sure the weight is distributed well rather than on a couple spindly little legs.
Doug
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