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.

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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 = 15-3

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 ?

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 = 15-3

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 ?

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