math
posted by snicky .
the best way to teach problem solving like the teacher has 15 student in his class and there are 3 more girls than boys how many girls than boys are there.

You have to learn how to "translate" the English into Math.
take it in pieces:
"there are 3 more girls than boys "
If we let the number of boys be x
then the above says there are x+3 girls
"the teacher has 15 student in his class"
or
the sum of the number of boys and girls is 15
x + x+3 = 15
2x = 153
2x = 12
x = 6
check: if there are 6 boys then there have to be 6+3 or 9 girls.
Are there 15 students in the class?
is 6+9 = 15 ?
Respond to this Question
Similar Questions

Math
Mrs.Smith's class has 12 girls and 8 boys. What percent of he class are girls? 
psychology
Researchers have found that, during childhood: A) girls' gender schemas are more rigid than boys' gender schemas. B)when boys play with girls, the boys lose status. C)boys like it when girls dress and behave like boys. D)girls express … 
Maths
There are 40 pupils in a class. There are 10 more boys than girls. When some boys from another class join the class, the percentage of boys to girls becomes 70%. How many boys joined the class? 
math
There are 24 students in Mr.Hills class. The number of boys and number of girls are both prime numbers. There are 2 more boys then girls. How many boys and how many girls are in each class? 
math
There are 27 students in Mrs. Reeds class. The number of boys and number of girls are both composite numbers. There are 3 more girls than boys. How many girls and how many boys are in the class? 
mathematics
there are 5 more girls than boys in a class. if 2 boys join the class, the ratio of girls to boys is 5:4. find the number of girls in the class. 
Math
Which table correctly fills in the ratio table below? 
Mathematics
There are 5 girls more than boys in a class. if 2 boys joined the class the ratio of girls to boys is 5:4. find the total number of student in the class. 
Math
can you please help me work on this problem? 
maths
There 168 students in a school. There are twice as many girls as there are boys. a) Calculate the number of girls in the school. b) the students are to be divided into seven classes so that each class has the same number of girls and …