Question

89. A class is divided into two sections A and
B. Passing average of 20 students of section A is
80% and passing average of 30 students of
section B is 70%. What is the passing average of
both the sections?​

Answer 1

Answer:

75%

step by step:

if average passing % of section a is 80 and no of students in section a is 20 than total marks of section a is 80×20= 1600

if average of section b is 70% nad no of students is 30 than total marks of section b is 30×70 =2100

and average of both section is (1600 +2100)/50=75

Answer 2

Answer:

20 students passing in section A Is 80%=80*20=1600

30 students passing in section B is 70%=70*30=2100

total students=20+30=50

1600+2100/50=74%