self Maths Puzzle

5,9,16,28,48,__,__

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self Other Question

If a company invests Rs.2.5 lakhs for initial setup and its maintenance cost is Rs.60000 per year.After what duration the running cost of the plant will become Rs.20000 per month? Vinoth can complete a painting work in 20 days. Prakash can do the same work in 25 days. They start the work together but Vinoth quit after 3 days of work. How many days are required to complete the remaining painting work by Prakash.