Question

The average weight of 7 persons increases by 3 kg when a new person comes in place of one of them weighing 56 kg. What might be the weight of the new person?

• A. 66 kg
• B. 77 kg
• C. 59 kg
• D. 71 kg

Answer 1

Answer:

B. 77 kg

The weight of the new person is 77 kg.

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• New Weight = Weight of replaced person + (Total people $\times$ Increase in average)

• Calculate total weight increase:

  • The average increases by 3 kg.

  • There are 7 people in total.

  • Total weight added is 21 kg ($7 \times 3$).

• Find the new weight:

  • The replaced person weighed 56 kg.

  • The new person adds 21 kg.

  • New weight equals 77 kg ($56 + 21$).