In apartment T if the number of 1 BHK flats are 18% more than that of apartment Q and the number of 2 BHK flats are 20% less than that of apartment S, then find the total number of flats in apartment T.
Total number of flats in all four apartments = 500 Now, (A + 3A + 3A – 5 + 4A – 5)% = 100% => (11A – 10)% = 100% => A = 10% 
Number of 1 BHK flats in apartment T = (118/100) x 100 = 118 Number of 2 BHK flats in apartment T = (80/100) x 50 = 40 Total number of flats in apartment T = 118 + 40 = 158
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