Question

The number of rows is 6 class is equal to the number of columns . If the number of rows is
“b” then the tolal students in the 6 class are:
(a) 2b
(b) 2+b
(c) b2
(d) 0

Answer 1

if each class contains equal number of rows and columns, then the number of students in that class in "rows*columns"

hence if there is an aggregate of 'b' rows in all classes then the number of columns must be 'b' as well per the given condition
hence
answer is
$b { }^{2}$