Final answer:
To write the proportion as a fraction, we use the formula Part / Whole = Fraction. In this case, the number of girls is the part and the total number of people in the group is the whole. Simplifying the fraction gives us 3 / 10.
Step-by-step explanation:
To write the proportion as a fraction, we can use the formula:
Part / Whole = Fraction
In this case, the number of girls (12) is the part and the total number of people in the group (40) is the whole.
So the proportion can be written as:
12 / 40
Now, we simplify the fraction by dividing both the numerator and denominator by their greatest common factor, which is 4.
Dividing 12 by 4, we get 3, and dividing 40 by 4, we get 10.
Therefore, the simplified fraction is:
3 / 10