The mean weight (in kg) of four students is 30. The weights of three of them are 42 kg, 28 kg, and 24 kg. What is the weight (in kg) of the fourth student?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 26.
Total weight of 4 students = 4 × 30 = 120 kg
Sum of known weights = 42 + 28 + 24 = 94 kg
Weight of fourth student = 120 - 94 = 26 kg