self Maths Puzzle

12 children take 16 days to complete a work which can be completed by 8 adults in 12 days. 16 adults started working and after 3 days 10 adults left and 4 children joined them. How many days will it take them to complete the remaining work?
option
(a) 6
(b) 8
(c) 4
(d) 3

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self Other Question

A can do 1/3 of the work in 5 days and B can do 2/5 of the work in 10 days. In how many days both A and B together can do the work?

(a) 7 1/4
(b) 8 4/5
(c) 9 3/8
(d) 10
WHY 2 PLUS 2 IS 4 IS CAN IT BE 5.