WBCS.LIVE practice question

The average weight of three men ‘X’, ‘Y’ and ‘Z’ is 75 kg. Another man ‘A’ joins the group and the average weight now becomes 80 kg. If another person ‘B’ whose weight is 5 kg more than ‘A’ replaces ‘X’, then the average weight of ‘Y’, ‘Z’, ‘A’ and ‘B’ will be 85 kg. What is the weight of ‘X’?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 80 kg
  2. 84 kg
  3. 82 kg
  4. 78 kg

Correct answer and explanation

Correct answer: 80 kg

Explanation: ✅ Correct Answer: A) 80 kg 📚 Explanation: Total weight of X+Y+Z = 75 × 3 = 225. Total with A = 80 × 4 = 320. Weight of A = 320 - 225 = 95. Weight of B = 95 + 5 = 100. Total Y+Z+A+B = 85 × 4 = 340. Y+Z = 340 - (95 + 100) = 145. Finally, X = 225 - 145 = 80 kg.