Question

In a class of 40 students, the average weight is 72 kg. One student of weight 68 kg left and three new students with an average weight of 75 kg joined the class. When a teacher’s weight is also included, the average weight of the class becomes 74 kg. What is the weight of the teacher?

A 145 kg
B 152 kg
C 140 kg
D 148 kg
E 138 kg
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