There were 76 pupils in two classes altogether. After one pupil was transferred from class A to class B, the two classes had the same number of pupils. How many pupils were there in class B at first?
A35
B36
C37
D38
Ans 2:
Class : Class 4
ans-c
A+B=76
NOW ONE PUPIL FROM CLASS A TRANSFERED TO CLASS B
SO NO OF PUPIL IN CLASS-A=A-1
ONE PUPIL ADD TO CLASS B SO CLASS B=B+1
NO OF PUPIL ARE SAME AFTER TRANSFER FROM CLASS A TO B
SO,IT WILL BE 38 STUDENT IN EACH CLASS
NOW
A-1=38
A=39
B+1=38
B=37
SO NO OF PUPIL IN CLASS B WAS 37 AT FIRST