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The average weight of a class of 29 students is $$49\text{ kgs}$$. If the weight of the teacher be included, the average raises by $$500\text{ gms}$$. The weight of the teacher is
Total weight of the students $$= 29 \times 49 = 1421\text{ kg}$$. With the teacher the average becomes $$49.5\text{ kg}$$, so the total is $$30 \times 49.5 = 1485\text{ kg}$$. The teacher weighs $$1485 - 1421 = 64\text{ kg}$$.
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