A Drama club has 40 members. The number of girls is 5 less then 2 times the number of boys. How many members are boys? girls?

We can write b = boys, and g = girls

we know that girls are equal g = (2*b-5)

we also know that b+g=40

we will replace girls with the above equation and get

b + (2*b-5) = 40, 2*b=2b

b+2b = 40+5

3b=45, divide everything by 5

b=15

girls are 2*15-5=25

15+25=40