Book Maths Puzzle Numerical Ability

Find a fraction having denominator 40 and it is equal to 3/5.

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Book Other Question

Find the successive term of the following series.
5,8,13,21,34,........
raju can do a piece of work in 10 days.vickey in 12 days and tinku in 15 days.they all work together but raju leaves after 2 days and vicky leaves 3 days before the work is completed. in how many days is the work is completed.