পাঁচ ডজন ডিমের মধ্যে কয় হালি ডিম আছে? 
To solve this problem, let's analyze it step-by-step:

Step-1: We have 5 dozens of eggs. So we have total 5*12 = 60 eggs

Step-2: We have to find number of “Hali” (1 Hali = 4 pcs). So, number of “Hali” for 60 eggs is 60/4 = 15 Hali.

#Answer: 15 hali