২৬৯৭১
A tank can be filled with water by two pipes A and B together in 36 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in -
উত্তর
90 munutes
২৬৯৭২
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.
উত্তর
22
২৬৯৭৪
In a 729 liters mixture of milk and water , the ratio of milk to water is 7:2 To get a new mixture containing milk and water in the ratio 7:3 the amount of water to be added is -
উত্তর
81 liters
২৬৯৭৫
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?
উত্তর
33
২৬৯৭৬
The average of 6 numbers is 7. The average of three numbers of them is 5. What will be the average of remaining numbers?
উত্তর
9
২৬৯৭৭
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?
উত্তর
90 m
২৬৯৭৮
In a group of 52 persons , 16 drink tea but not coffee and 33 drink tea. How many drink coffee but not tea?
উত্তর
19
২৬৯৮০
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?
উত্তর
15 km /hr