Gosh! I flunk WA

__residentia__l test for 2 points on water piping systems. Need some help here as I need to retake the test. I was having problems in calculating the total fixtures units to match the 4 answers in the test. I had the table 610.3 with me and I added the correct numbers, including the first hose bibb as 2.5 and the extra hose bibbs as 1, etc., (no problems here) but,__I think__the problem was related to the sprinkler heads calculation. There are, in one pipe section 20 sprinkler heads and in another pipe section 12 sprinkler heads, so I calculated them as 1wsfu per head or 32wsfu. But, my total wsfu didn’t match the 4 answers in the test and I think the problem was related to the sprinkler heads. Any hint appreciate.
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