If a man rows 1200 meters in 5 minutes and returns back in 20 minutes. Find the speed of the stream.
Correct!
Wrong!

Find the units digit of $2016^{2015}  2015^{2016}$
Correct!
Wrong!

A vessel contains 64 litres of milk. From this vessel 16 litres of milk is taken out and is replaced with equal amount of water. Find the amount of milk in the vessel after 3 such operations
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