QUESTION
The ratio of the number of girls to boys is 5:4. There are 250 boys.
A: How many girls are there?
B: How many children are there?
ANSWER
Let's do the ratio and proportion - means vs extremes - method to solve this problem. See the attached image for the solution.
[tex]5:4=girls:boys[/tex]
Let the number of girls be [tex]n[/tex],
[tex]5:4=n:250[/tex]
[tex][Sol]\\4n=5(250)\\4n=1250\\n=\dfrac{1250}{4}\\n=312.5\cong \bold{312}[/tex]
A. How many girls are there? Answer: 312 girls
B. How many children are there? Answer: 562 children
[tex][Sol]\\312 + 250 = \bold{562}[/tex]
