1.

in a class if 3 students sit on each bench 1student will be left if 4 students sit on each bench 1 bench will be left find no of students and no of benches in that class

Answer»

Let number of STUDENTS be "N"
and number of BENCHES be"n"
so 3 students on each benches student left will be 1
3n+1=N
4n-4=N
or
3n-N=-1.....1
4n-N=4.............2
subtracting 1 and 2 we GET 
n=5
putting n=5
in in 1
15-N=-1
N=16
so number of student are 16 and number of benches are  5


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