Question

the ratio of boys to girls in the auditorium was 4 to 5 if there were 40 boys in the auditorium how many girls were there

Answer 1

50

Answer 2

b=boys
g=girls
b/g = 4/5
b=40, so:
40/g = 4/5
so, 4g=5*40
g=50
50 girls

Answer 3

for 4 boys there are 5 girls :P

so for 40 boys there are 50 girls