a number of girls in class is 9 more than the number of boys. if there are 39 students in all, how many girls are there in the class?

Answer 1

Let's denote the number of boys as B and the number of girls as G.

We know that the number of girls in the class is 9 more than the number of boys, so we can write the following equation:

G = B + 9

We also know that there are 39 students in the class, which means that the total number of boys and girls is 39:

B + G = 39

Now we can substitute the first equation into the second equation:

B + (B + 9) = 39
2B + 9 = 39
2B = 30
B = 15

Now that we have found the number of boys, we can substitute this value back into the first equation to find the number of girls:

G = 15 + 9
G = 24

Therefore, there are 24 girls in the class.