The average weight of 3 students is 45 kg. If one more student weighing 51 kg joins, what's the new average weight after the student joins?
Show answer & explanation
Correct answer: A
Explanation
Average weight of 3 students = 45 kg
Therefore, total weight of 3 students = 45 × 3
= 135 kg
Weight of the new student = 51 kg
Total weight of 4 students = 135 + 51
= 186 kg
New average weight = 186 ÷ 4
= 46.5 kg