At South High School, 37% of the teachers are between 22 and 30 years old, 25% are between 31 and 40
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45 handshakes would take place! i've attached how i figured this out (pardon the scribbles)
well, in short, the students and chaperones are at a 2 : 9 ratio, and we know there are 171 students, how many chaperones then, so long they maintain a 2:9 ratio?