Answers

2015-05-27T16:03:07+05:30
1/6 = A.A
1/4 = A
x   = B.A
total no . of students in the class = 48
no . of students who are A.A = 1/6×48=8
no . of students who are A    = 1/4×48=12
no . of students who are B.A = 48-8+12=48-20=28
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2015-05-27T16:08:01+05:30
Total no . of students who are below average =  1-1/6+1/4
                                                                = 1-5/12
                                                                 = 7/12
       no . of students who are below average = 7/12×48
                                                                 ⇒ 28 .
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