Classmates

Roman is ranked 12th highest and eleventh lowest pupil. How many classmates does Roman have?

Correct result:

x =  21

Solution:

a=12−1=11 b=11−1=10 x=a+b=11+10=21a=12-1=11 \ \\ b=11-1=10 \ \\ x=a+b=11+10=21

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