A. 76 kg

B. 77 kg

C. 74 kg

D. 75 kg

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### Solution(By Apex Team)

According to the question, Average weight of 25 students = 50 kg Sum of the weight of 25 students = 50 × 25 = 1250 kg If the class teacher included the average is increased by 1 kg. ∴ Average weight of 25 students and teacher = 51 kg $\begin{array}{l}\text{∴ Sum of weight}\\ \text{= 26 × 51}\\ \text{= 1326 kg}\\ \text{∴ Class teacher weight}\\ \text{= 1326 – 1250}\\ \text{= 76 kg}\end{array}$