100 people at dinner. 90 had french heritage, 80 had english heritage, and 75 had native american heritage. at least how many had heritage from all theee cultures?

At least there should be 245 people at dinner if u add 80,90, and 75

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.