7th grade math
posted by Mercedez .
There are 48 students in a school play. The ratio of boys to girls is 5:7. How many boys are in the school play? Explain how you found your answer.

I'd set up a proportion (ratio).
5/12 = b/48
12b = 240
b = 20 
Where did you get the 5/12 from when it's 5/7?

You're comparing the number of boys with the total.
5 + 7 = 12 
A school has 1800 students on its roll 40% of whom are girls how many boys are there in the school

on the question above the one with no answer i got that answer but my teacher says it is wrong who is right and how did you get this answer?
Respond to this Question
Similar Questions

Math
For every girl taking classes at the martial arts school, there are 3 boys who are taking classes at the school. If there are 236 students taking classes, write and solve a porportion to predict the number of boys taking the classes … 
Math
What is 5/8 + 4/7 1 ? I can't understand this math problem.... Please help me....  Problem: In a boys' school, 5/8 of the boys play football and 4/7 play rugby. If every boy plays at least one of the two games, find 
Maths
I can't understand this math problem.... Please help me....  Problem: In a boys' school, 5/8 of the boys play football and 4/7 play rugby. If every boy plays at least one of the two games, find the fraction of the … 
Math
Nicole drew a circle on the chalkboard that had a radius of 15 cm. Which is closest to the circumference in centimeters of the circle she drew on the board? 
Math
there are 48 students in a school play. The ratio is 5:7 How many boys are in the school play? 
Math
The ratio of boys to the total number of students in a school play is 7:10. There are 9 girls in the school play. How many students are in the school play? 
MATHS
Two different schools (A and B) have the same number of pupils. The ratio of the boys in school A and the boys in school B is 2:1 and the ratio of the girls in school A and the girls in school B is 4:5. Find the ratio of the boys in … 
math
the current ratio of boys to girls at a certain school is 2 to 5 . if 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. how many boys currently attend the school? 
math
At a sports carnival,the ratio of number of pupils sent by school A,B and school C to the event was 1:2:3. The number of boys from school A and the number of girls from school B were the same. The ratio of the number of girls from … 
Math
. If there are 1050 students in a school and the ratio of boys to girls is 9:5, then what is the number of boys in the school?