The average weight of 39 students is 30 kg. By the admission of a new student, the average comes down to 29.8 kg. Find the weigth of the new student.

A 22 kg
B 22.6 kg
C 31 kg
D 29.8 kg

Correct Answer: 22 kg

Let, the sum of 39 students' age = a, And the weight of the new student = b So, a39 = 30 ⸫ a = 39 × 30 And, a + b40 = 29.8 ⇒ a + b = 29.8 × 40 ⇒ b = 29.8 × 40 - a = 29.8 × 40 - 39 × 30 = 22 kg
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