Four subjects – Physics, Chemistry, Mathematics and Biology – were taught in four consecutive periods of one hour each starting from 8:00 a.m. At what time was the Chemistry period scheduled?
i) Mathematics period ended at 10:00 a.m., which was preceded by Biology.
ii) Physics was scheduled in the last period.
iii) Mathematics period was immediately followed by Chemistry.
Which statement is sufficient to get the answer?
Only I
Either I only or II only
Only II
Only I and III
(D) From I alone, we conclude that Mathematics period began at 9.00 a.m., Biology period began at 8:00 a.m. hence chemistry period starting at either 10am or 11am. (option-A eliminated)
From II alone, Physics period began at 11 a.m. So, the Chemistry period began either at 8am or 9am or 10am. (option-C eliminated)
Therefore option C is also eliminated.
From I and III, we conclude that Mathematics period ended and Chemistry period began at 10:00 a. m.
Nine litres are drawn from a cask full of water and it is then filled with milk, Nine litres of mixture are drawn and the cask is again filled with milk, The quantity of water now left in the cask to that of the milk in it is 16 : 9. How much does the cask hold?
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