Problema Solution
The ratio of girls to boys is 3:5. If there were 120 children altogether how many girls are there?
Answer provided by our tutors
Let
x = the number of girls
y = the number of boys
x : y = 3 : 5 cross-multiply
5x = 3y
There are 120 children altogether:
x + y = 120
We need to solve the following system of equations:
5x = 3y
x + y = 120
........
click here to see the system of equations solved for x and y
........
x = 45 girls
y = 75 boys
There are 45 girls.