How much do egg yolks and whites weigh, in grams?
The rule of thumb to divide an egg is:   


60% egg-white  
30% yolk  
10% shell 


So it depends on the size of egg you use (note that the size definition varies between countries). 

Example:
For a 60g (middle of the weight range) European M / American L egg, that's 60*0.6 = 36g whites and 18g yolk.

-> So you'd need (about) 10-11 whites and 13-14 yolks.

Of course, not all eggs have the exact same weight and therefore I recommend you use the estimated number of necessary eggs as a guideline and weigh the whites and yolks.