The average weight of P and his three friends is 55kg. If P has 4 kg more weight than the average weight of his three friends, what is P's weight (in kg)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 58.
We know that,
Average = Sum of observations/Number of observations
Now,
Let the weight of P be x kg,
Then, the total weight of P and her friends = 55 × 4 = 220 kg
Then according to the question,
P has 4 kg more weight than the average weight of her 3 friends, thus
⇒ (220 - x)/3 + 4 = x
⇒ (220 - x)/3 = x - 4
⇒ 220 - x = 3(x - 4)
⇒ 220 - x = 3x - 12
⇒ 3x + x = 220 + 12
⇒ 4x = 232
⇒ x = 58
Hence, the weight of P is 58 Kg