In a class of 42 students, the number of boys is 12 fewer than twice the number of girls. find the number of girls

Question

I can solve the problem by myself, I just need the equation.

Thanks

Answer 1

let:  b=number of boys  and  g=number of girls

we know that b+g=42 (1)   and  b=2g-12 (2)  These are the eguations you need

solving for g and b from equations (1) and (2) we get girls = 18. and. boys = 24