The average weight of 30 girls in a group is 35 kg. When a new girl is included, the average weight increases by 2 kg. What is the weight of the new girl?

Explanation

Given: The average weight of 30 girls in a group is 35 kg. When a new girl is included, the average weight increases by 2 kg. Concept used: Total = Average × Number of entities Calculation: Total weight of 30 girls = 35 × 30 = 1050 kg New average weight = 35 + 2 = 37 kg Total number of girls now = 30 + 1 = 31 New total weight of 31 girls = 37 × 31 = 1147 kg Now, the weight of the new girl = 1147 - 1050 = 97 kg ∴ The weight of the new girl is 97 kg.