If 20% of the 2 BHK flats in apartments R are vacant then find the sum of filled 2 BHK flats in apartment R and the number of 2 BHK flats in apartment S.
Total number of flats in all four apartments = 500 Now, (A + 3A + 3A – 5 + 4A – 5)% = 100% => (11A – 10)% = 100% => A = 10% 
Number of filled 2 BHK flats in apartment R = 25 x (80/100) = 20 Number of 2 BHK flats in apartment S = 50 Required sum = 20 + 50 = 70
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