Good evening ,
Answer:
30
Explanation:
Let g represent the number of girls
and b represent the number of boys
they are in a ratio of 2 girls to 6
then the number of girls = two sixth the number of boys
then g=(2/6)b
since 40 = g + b then 40 = (2/6)b + b then 40= (8/6)b
then b=(6/8)×40 then b=(40×6)÷8=30.
:)