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nikita dhingra from Delhi public school, Chandigarh, Chandigarh
Subject :IMO    Class : Class 9

M and N alone can do a work in 21 and 42 days respectively. In how many days they can complete the work, if they work on alternate days?

A14
B28
C42
D35


Ans 1:

nikita dhingra from Delhi public school, Chandigarh, Chandigarh
Class : Class 9

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