If 20 students are sent from B to A , the number of students in A is double the number of students in B . Represent this situation algebraically in form of linear equation in two variables.
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Similarly, if 20 students are sent from hall B to hall A, then the number of students in Hall A would be twice that of the students in Hall B. or a = 100. Therefore there are 100 students in Hall A and 80 students in Hall B.
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b/2=a+20
cause if you multiply two in a or rather divide b by 2
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