A box contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. The number of blue balls in the jar is
13
12
16
16
D.
16
The population of a city is 250 thousand. It is increasing at the rate of 2% every year. The growth in the population after 2 years is
2500
10000
252000
252000
If a point (x, y) in a OXY plane is equidistant from (-1,1) and (4,3) then
10x+4y = 23
6x+4y = 23
–x+y = 7
–x+y = 7
A rod of 2 cm diameter and 30 cm length is converted into a wire of 3 meter length of uniform thickness. The diameter of the wire is
2/10 cm
2/√10 cm
1/√10 cm
1/√10 cm
Two straight poles of unequal length stand upright on a ground. The length of the shorter pole is 10 meters. A pole joins the top of the two vertical poles. The distance between the two tops is 5 meters. The distance between the poles along the ground is 4 meter. The area thus formed by the three poles with the ground is
52 meter2
46 meter2
20 meter2
20 meter2
Pipe A can fill a tank in 10 hours and pipe B can fill the same tank in 12 hours. Both the pipes are opened to fill the tank and after 3 hours pipe A is closed. Pipe B will fill the remaining part of the tank in
5 hours
4 hours
5 hours 24 minutes
5 hours 24 minutes
A ground 100×80 meter2 has two cross roads in its middle. The road parallel to the length is 5 meter wide and the other road is 4 meter wide, both roads are perpendicular to each other. The cost of laying the bricks at the rate of Rs. 10 per m2, on the roads, will be
Rs. 7000
Rs. 8000
Rs. 9000
Rs. 9000
If selling price of 10 articles is equal to cost price of 11 articles, then gain is
8%
9%
8.5%
8.5%
