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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?
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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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