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Given: a + 3b = 18 ..... (I) And 3a + b = 30 ....... (II) On subtracting equation (I) from equation (II) , we have; 2a - 2b = 12 So, a - b = 6 Hence, option b.
A set (Set ‘P’) of 4 pipes can fill ______% of a tank in 5 minutes while another of set (Set ‘Q’) of 5 pipes can empty the 60% of completely fil...
Which of the following is the justification that aligns text on both margins of a document in Word?
Time is taken by two trains running in opposite directions to cross a man standing on the platform in 28 seconds and 18 seconds respectively. It took 24...
A train of length 260 m crosses another train of length 120 m running is opposite direction in 5 sec. If speed of longer train is 90 km/h, then in what ...
The downstream speed of a boat is 4 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream ...
Two places X and Y are 450 km apart. A truck leaves place X from place Y and at the same time another truckleaves placeY to X. Both the men meet 9 hours...
The question consists of four statements: I, II, III and IV given below it. You have to decide whether the data given in which of the following statemen...
The main folder on a storage device is known as
If the sum of the squares of the roots of p2 - (x-2)p - (x+1) = 0 is 5 then what is the value of x.
The ratio between the speed of a bus and train is 15:27 respectively. Also, a car covered a distance of 720 km in 9 hours. The speed of the bus is three...
