A bin contains only cement.2 kg of sand is added to the bin.The resulting mixture has 10% sand by weight.How much of sand must be added to the bin in order to form a mixture which has 40% sand by weight?(in kg)
10.25
11
10
12.75
The population of a country three years ago was 2 millions.it increased by 20% in the first year,decreased by 20% in the second year and after that decreased by 10% in the third year.Find the present population of that country.(in million)
1.536
1.944
1.728
1.278
When mohan was born,his father rohan was 21 years old.The present age of rohan is 4 times that of mohan.How many years ago was rohan 8 times as old as mohan?
3
4
5
6
How many prime numbers less than 2000 are multiples of 11?
more than 181
more than 1 but less than 181
1
0
The distance between anand's school and bhavan's home is 37 km.anand started from his school to bhavan's home at 2kmph.One hour later bhavan started from his home towards anands school at 3 kmph.How far from Bhavans home do both meet?(in km)
12
15
18
21
A ceratin population of bacteria triples every 20 minutes.If the starting population of bacteria is 10^3, what will be the population after an hour?
3(10^3)
3^3(10^3)
10^9
none
Atank is fitted with 3 inlet pipes which can independently fill it in 3 hours,4 hours and 5 hours respectively.Two of the pipes are opened simultaneously.The part of the tank that can be filled in one hour by those two pipes is at most
7/12
8/15
9/20
9/10
Ashok's office is 16 km away from his home.In the evening ,he drives to his son's school which is 8 km from his office to pick his son.He then drives 6 km to gym.If he is y km from his home,find the range of y
2<=y<=14
2<=y<=16
2<=y<=18
2<=y<=30
A fair coin is tossed 8 times.6 of the tosses result in tails.If the coin is tossed once more,what is the probability that the coin shows a tail?
40%
50%
60%
75%
a right circular cone is made such that the sum of its height and its raius is 12cm.Find the radius and the height when the cone will have the maximum volume(in cm,inches)
8,4
9,3
4,8
3,9