Question

the number of students in section a is 3 less than twice the number of students in section B if second year has 45 students find the number of students in section b

Answer 1

Let students of section b be x.
The number of students in section a is 2x-3, according to the question.

So if the second year has 45 students,
and we say that this is for the second year then
students of sec a + sec b =45
or
x +2x -3=45
or
3x=48 or
x=16..
Hope this helps..