Syntel Company Numerical Ability Time and Work

An Navy ship has enough supplies for its crew of 90 men for 70 days. On the 30th days of the voyage 10 more
sailors joined the crew. How many more days would the supplies last?

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Syntel Other Question

Andy and Brad can finish a piece if work in 12 and 9 days respectively. They start off together and Andy leaves
on the third day. How many days more would Brad take to complete the work?
A pump usually fills a tank in 8 hours but due to a whole in the tank it took 10 hours to fill the tank. How much
time will it take the whole to drain the whole tank?