Question

. In the computer lab there are 3 computer for every 6 student how many computer will be needed for 24 students

Answer 1

6 student =3 comp.
$1 \: student \: = \frac{3}{6} = \frac{1}{2} \\ 24student \: = \frac{1}{2} \times 24 = 12 \: comp$

Answer 2

3 computers for every 6 students
that is 1 computer for every 2 students
the number of computers is half the number of students .
then there will be 12 computers for 24 students.