Cognizant Company undefined

if nc5=nc6 what is value of n

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Cognizant Other Question

A water filter takes 40 minutes to filter 20 liters of water Another filter of same specifications takes 30 minutes to filter the same amount of water If both the filters are used at the same time, then how long will it take them to filter 70 liters of water?
A) 30 minutes
B) 45 Minutes
C) 60 minutes
D) 90 minutes
Alice,Bob,Chris,Dave,Eric,Fred,Laura used to work in a restaurant for 6 days from Tue-Sun and every one is worked for one day and at least 2 members work on a day, Mon is holiday

Restrictions:

1) Either Alice or Bob work on 1st day
2) Laura works only on 4th and 5th days
3) A 1day gap is left between Laura and Chris
4) Eric works Immediately after Bob