If P= 2² + 6² + 10² +14² +……..94² and Q=1² + 5² + 9² +……..81², then what is the value of P- Q ?

A tank is fitted with two taps. The first tap can fill the tank completely in 45 minutes and the second tap can empty the full tank in one hour. If both the taps are opened alternately for one minute, then in how many hours the empty tank will be filled completely?

A trader sold an article at profit of 20%. Had he bought that article at 60% less price and sold it at Rs 90 less, then he would have gained 50%. What is the value (in Rs) of cost price? 

A tap can fill a Tank in 16 hours. Due to a hole in its base it is filled in 24 hours, If tank is full then in how many hours it will be empty through the hole. 

The average of 8 readings is 24.3, out of which the average of first two is 18.5 and that of next three is 21.2. If the sixth reading is 3 less than seventh and 8 less than eight, what is the sixth reading? 

What approximate value will come in place of the question mark (?) in the following questions?

175 x 28 + 275 x 27.98 =? 

In the given figure ABCD is a Parallelogram then the find out of the value of x is?

A starts a business, after 6 months B also join him with Rs.4500 and after 2 months of B’s joining C also join them with Rs.4500. If A gets approx. Rs 4900 out of total annual profit of Rs. 10,000 then find the approximate value of initial investment of A.