Question

12) The average marks of 25 students in physics was 20 .
The average marks of the first 12 students was 16 and
that of the last 12 students was 24. What was the marks
scored by the 13th student?
A) 16
B) 18
20
D) 22​

Answer 1

Answer:

25×20=500

12×16=192

12×24=288

288+192=480

then 500-480=20(ans)