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In a gym the average weight of 12 people and the trainer is 66 kg. If the weight of the trainer is not taken into consideration then the weight increases by 2 kg. What is the weight of the trainer?

In a gym the average weight of 12 people and the trainer is 66 kg. If the weight of the trainer is not taken into consideration then the weight increases by 2 kg. What is the weight of the trainer? Correct Answer 42

Given:

Average weight of 12 people and the trainer = 66 kg

Calculation:

The weight of 12 students and the trainer = 13 × 66

⇒ 858 kg

Total weight excluding the trainer = 68 × 12

⇒ 816

The weight of the trainer

⇒ 858 – 816

⇒ 42 kg

∴ The weight of the trainer is 42 kg. 

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