Question

(a) Find the total weight of 9 persons?​

Answer 1

Answer:

Let the weight of one person be =' x' kg

So, weight 9 people= 9×x= 9x kgs.

Answer 2

Answer:

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Step-by-step explanation:

the average weight of 9 persons =50 kg.

Total weight of 9 persons =50 × 9= 450 Kg

the average weight of the first 5 persons = 45 kg

Total, the weight of 5 persons =45 ×5= 225 Kg

Whereas, the average weight of the last 5 persons = 55 kg

Total weight of last 5 Persons =55×5=275 Kg

Let the weight of 5th person =x kg

→→→5th person is included two times.

So, Weight of 5th Person = 275 +225-450

             =500 - 450

             =50 Kg

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