Question

The average weight of 15 students in a class increases by 1.5kg when
one of the student weighing 40 kg is replaced by a new student. What
is the weight (in kg) of the new student?
A: 62.5 kg
B: 60 kg
C: 64 kg
D: 50 kg​

Answer 1

Answer:

Step-by-step explanation:

Let the weight of 1 student = x kg

Let the weight to 15 student = 15x kg

Let the weight of new student = y kg

According to the question

15x - 40 + y = 15 (x + 1.5)

15x - 40 + y = 15x + 22.5

y = 62.5 kg