The ratio of boy to girls in a class is 3 : 2. there are 15 boys in the class. how many total boys and girls are in the class? a) 15 b) 23 eliminate c) 25 d) 35

If the ratio is 3:2, put 15:?
This is how we set up proportions.
Now, divide your number of boys, 15, by the ratio of boys, 3.
This is how we find the dilation.
Since we end up with 5, we know the scale factor.
Multiply 2 by 5, and you get 10.
Add 10 and 15, you get 25.
Your answer is C.) 25.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.