self Maths Puzzle

4 men and 6 women can complete a work in 10 days.26 men and 48 women can finish the same work in 2 days.15 men and 20 women can do the same work in how many days ?

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self Other Question

Find N th term of the sequence, 1, 2, 4, 7, 11.

Please Friends, Help me in solving the this problem. let set M={M1,M2,M3,...,M10},where all 10 elements are distinct.if sets are formed which contain 1 or more elements of set M,with subscript of each elements in a specific set being an integral multiple of the smallest subscript in the set,how many such sets can be formed?