Question 926528

a math club has {{{40}}} members. 

the number of girls {{{g}}} is {{{5}}} less than {{{2}}} times the number of boys {{{b}}}

 how many members are boys


equation 
1:{{{b+g=40}}}
2:{{{g=2b-5}}}...substitute in 1

{{{b+2b-5=40}}}

{{{3b=40+5}}}

{{{3b=45}}}

{{{b=45/3}}}

{{{b=15}}} members are boys

then

{{{b+g=40}}}

{{{g=40-15}}}

{{{g=25}}} members are girls