there are chairs from no.27 to 66 in a row at an auditorium how many chairs are there in a row ?
is P = NP?
https://math.he.net/question/ae15ea2d2ebc39589ac9da943bf7e66d59a65f10
75% is to 1/2 as 45% is to ______
25-18=7=37-30
512.30 - 15%=
5y x 6
what is the last prime number
0.75 is to 3⁄4 as 0.8 is to ______
does the set of all non-empty sets contain itself?