the total number of students in the maths club is 40
the number of boys is 5 less than 2 times the amount of girls
to find the number of girls and boys let the number of girls be X.
so 2X-5= the number of boy
so, X+ 2X-5=40
3X-5=40
3X=40+5
3X=45
X=45/3
X=15
the number of girls is 15
and the number of boys is 15x2-5=25 boys