A tank has two leakages. The first leakage alone can empty the tank in 9 minutes and the second alone would have done it in 6 minutes. If water leaks out at a constant rate. how long does it take both the leakage together to empty the tank ?
Worker P is 50 % as efficient as worker Q. Worker R does half of the work done by P and Q together . If R alone does the work in 40 days , then P, Q, and R together can do the work in -
The sum of the circumference of a circle and the perimeter of a rectangle is 130 cm. The area of the rectangle is 104 cm2 and the length of the rectangle is 13 cm. What is the area of the circle ?
A box is made in the form of a cube. If a second cubical box has inside dimensions three those of the first box, how many times as much does the second contain?
If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
One filling pipe P is three times faster than another filling pipe Q , If P can fill the tank in 24 hours, then what is the time taken to completely fill the tank if both pipes are opened together?
A box contains 4 tennis ball 6 season and 8 dues balls . 3 balls are randomly drawn from the box. What is the probability that the balls are different ?
A square is inscribed in a circle of diameter 2 a sand another square is circumscribing circle. The difference between the areas of outer and inner squares is.
The income of 'A' is 20% higher than that of 'B' . The income of 'B' is 25% less than of 'C' What percent less is A ' s income form C's income?
(227 -75 +12) is equal to -
There are n students in a school . If r% among the students are 12 years or younger, which of the following expressions represents the number of students who are solder than 12?
125 gallins of a mixture contains 20% water , What amount of additional water should be added such that water content be raised to 25% ?
The sum of squares of two numbers is 80 and the square of difference between the two numbers is 36. Find the product of tow numbers.
A student loses I mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?
There are two stations of length 162 meters and 120 meters respectively . A train takes 15 seconds to pass first station and 18 seconds to pass another station . Determine the length of the train ?
A man rows a certain distance along the stream and against the stream in 1 hour and 1.5 hours respectively . If the velocity of the current is 3 km /hr. what is the speed of a man in still water?
A milkman pays tk. 6.40 per liter of milk. He adds water and sells the mixture at tk. 8per liter. By doing this, he makes 37.5% profit. Find the proportion of water to milk received by the customers?
A leading library charges c cents for the first week that a book is loaned and f cents for each day over one week. What is the cost for taking out a book for d days. Where d is greater than?
Find the compound interest at the rate of 10% per annum for four yearss on the principal which in four years at the rate of 4% per annum gives tk. 1600 as simple interest.
A wheel rotates 10 times per minutes and moves 20 m during each rotation . How many feet does the wheel move in 1 hour?
An Amount of tk. 366 is to be divided among P,Q and R in such a manner that Q gets two- third as much as P and R together , and P may get half as much as Q and R together . What is the share of P?
On dividing an individual number by 342, we get 47 as remainder. If the same number is divided by 18, what will be the remainder?
The length of a rectangle is 20% more than its breadth . Find the ratio of the area of the rectangle to that of the square whose side is equal to the breadth of the rectangle .
Rahim and Karim donated Tk. 100. each in charity . Karim gives each tk. 1 more than Rahim and Rahim distributes money to 5 more people than Karim . How many people are there in this charity ?