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Q.

Ravi and Kavi can do a piece of work independently in 9 days and 18 days respectively. If they are working on alternate days starting with Ravi, how long the work will take to get finished ?

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a

12

b

16 

c

14

d

13

answer is A.

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Detailed Solution

Ravi can do work in 1 day = 2 units

Kavi can do work in 1 day = 1 unit

By alternate days =2+1=3  units→1  turn(2 days)

For  '18'  units=183=6  turns⇒6×2  =12 days

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