(Let R=Right and L= Left)
There is 24R and 6L, x10 15yrs and x20 16yrs
from here, it says 15years L : 16 years L is 1:5 meaning there is only x1 15yrs L and x5 16yrs L because there is only 6 Left handed people.from here we get x9 15R, x1 15L, x5 16L, x15 16R. Therefore 9/30 = 3/10
Idk this is...