It would be 24 girls because 12 is half of 24, just like 2 is half of 4. It's also 24 because it's multiplying by 6, and 6 x 4 = 24.
LP= PN
So, Pn= 7
LP= 7
LN is a transversal, so Parallelogram Diagonals Theorem and PN is what you put in the boxes.
I hope this helps!
~kaikers
1. p=mv
v=p/m
so the answer B is the correct one