If 10 cats can kill 10 rats 10 minutes how long will it take 100 cats to kill 100 rats?

Water is filled in a cylindrical vessel in such a way that its volume doubles after every five minutes. If it takes 30 minutes for the vessel to befull, then the vessel will be fourth full in:

Five times an unknown number is 5 less than 50.The unknown number

Manju is ranked 14th from the top and 27th from the bottom among those who passed an examination.Six girls did not participate in the examination and five failed. How many students are in the examination and five failed. How many students are in the class?

Two runers, Gopal and John running round a circular track complete one round each in 7 minutes and 14 minutes respectively. They start at the same time. During the first 30 minutes how many times Gopal crossed John on the trade?

How many two digit numbers satisfy the property ‘‘The unit digit is the square of the ten’s digit?