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Mathematics
OpenStudy (anonymous):

the mem's of class r standing in a circle evenly spaced out #d in order, crystal is #17,stands across from chels who is #7. # of students?

OpenStudy (sandra):

They are standing across from each other only when they are half the circumference apart

OpenStudy (sandra):

that means that half the circumference is #17-#7 = 10 students

OpenStudy (sandra):

so the entire circumference is 20 students

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