(A) 14
(B) 25
(C) 28
(D) 29
Correct Option is: C
let the number of students initially in the class be A,
then, total height = A * 360—— 1
again the no of students increased = A + 10
then, total height A + 10 student = (A +10) * 336—-2
the total height of 10 student of 10 new students = 10* 292.8 = 2928cm—–3
from 1,2 , 3
(A+10) *336-2928 =A*360
336A+3360-2928=360A
A=18
Number of students in class = 18+10=28