The present age of john and marry are in the ratio of 6:4. Five years ago their ages were ratio of 5:3. How old is john now?

The present age of john and marry are in the ratio of 6:4. Five years ago their ages were ratio of 5:3. How old is john now? Correct Answer 30

ধরি, John এর বয়স 6x বছর এবং Mary এর 4x বছর 6x - 5 /4x - 5 = 5/3 20x - 25 = 18x - 15 20x - 18x = 25 - 15 2x = 10 x = 5 John এর বয়স = 6 × 5 = 30 বছর
গণিত অনুপাত-সমানুপাত (Ratio-Proportion) Bangladesh Development Bank Ltd Bangladesh Development Bank Ltd - Senior Officer - 24.11.2017
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