Answer:
a) 35, b) 25, c) 60
Step-by-step explanation:
The number of girls is 10 more than the number of boys, so it's a good thing to choose a variable to represent the number of boys.
Number of boys: b
Number of girls: b + 10
Ratio of girls:boys is 7:5, so

"Cross multiply" to get

There are 25 boys. There are 10 more girls, so the number of girls is 35, and the total number of students is 60.
That's a packed classroom!
To find the decimal, all you need to do is take the number on top and divide it by the one in the bottom. 129/3930=0.03
Answer:
You donf have the picture shown, how is anybody supposed to work on it
im pretty sure it's the first option.