Question

one fourth of total number of students in a class are in maths lab one third are physics lab one sixth are in chemistry lab and 10 are biology lab. how many are there in class

Answer 1

40 students in class

Answer 2

let total no. of students are x
then
x/4+x/3+x/6+10=x
or 9x/12+10=x
or x-(9x/12)=10
or 3x/12=10
or x=40..................(ans)