The ratio of girls to boys in a an astronomy club was 1 : 8. There were 5 girls. How many total members were there in the club?

45

Explanation:

If the ratio is 1 : 8 and there was 5 girls you would need to find the ratio of 5 girls to x amount of boys then add both genders together to find the total amount. You would need to multiply 8x5 to find the amount of boys.

8x5=40

Then add the five girls

40+5=45