Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q21.

Directions: Study the following information carefully and answer the given questions. In a bag X there are some identical green balls and rest other are blue balls (blue balls greater than the green balls). (i) Probability of getting 1 green and 1 blue ball without replacement is 40/87. (ii) Probability of getting both green is A. (iii) If there is another bag (Y) in which some blue balls and rest others are green. (iv) If a number of blue balls taken out from Y is 4 more than the green balls taken out from bag Y and added to bag X. Then the probability of getting both green from bag X is 13/123. What should be total number of balls in bag X ?

1)	10	2)	20
3)	29	4)	30

Q22.

Directions : Study the following information carefully and answer the given questions. In a bag X there are some identical green balls and rest other are blue balls (blue balls greater than the green balls). (i) Probability of getting 1 green and 1 blue ball without replacement is 40/87. (ii) Probability of getting both green is A. (iii) If there is another bag (Y) in which some blue balls and rest others are green. (iv) If a number of blue balls taken out from Y is 4 more than the green balls taken out from bag Y and added to bag X. Then the probability of getting both green from bag X is 13/123. What should be the value of A ?

1)	2/29	2)	3/29
3)	4/29	4)	5/29

Q23.

Direction: Data below represent the number of people required for various projects to be completed in various days: Project                      Situation 1                                                             Situation 2                  Number of workers       Days required          Number of workers       Days required  A              X                                   88                                                  X+8             66  B              Y                                  Y-1                                                  Y+6                    Y-6  C              Z2                           75                                                   M2                    108

1)	60 days	2)	80 days
3)	90 days	4)	120 days
5)	None of these

Q24.

Direction: Data below represent the number of people required for various projects to be completed in various days: Project                      Situation 1                                                             Situation 2                  Number of workers       Days required                  Number of workers       Days required  A              X                                   88                                                  X+8             66  B              Y                                  Y-1                                                  Y+6                    Y-6  C              Z2                           75                                                   M2                    108 If 64 people were working for Project A, how many days did it take to complete the work?

1)	33 days	2)	22 days
3)	36 days	4)	44 days
5)	None of the

Q25.	In a 96 litre mixture of water and milk, water is only 40%. The milkman sold 12 litres of the mixture to a customer and then added 10 litres of pure milk and 15 litres of water in the mixture. What is the approximate percentage of water in the final mixture?

1)	40	2)	42
3)	45	4)	48

Q26.

Direction: Each question below is followed by three statements I,II and III. You have to determine whether the data given in the statement/statements is sufficient for answering the question. You should use the data and your knowledge of Mathematics to choose the best possible answer. What is the speed of boat in still water ? I. The boat can cover 25 km downstream distance in 5 hours. II. Speed of the stream us two-third of the speed of boat in still water. III. The boat can cover 25 km upstream distance in 10 hours.

1)	I and II together	2)	Only II
3)	I and II together	4)	I and either II or III
5)	Any two statements together.

Q27.	A rectangular container, whose base is square of side 15cm,stands on a horizontal table and holds water up to 3cm from the top. When a cube is  placed in the water and is completely submerged, the water rises to the top and 54cm^3 of water overflows. What is its surface area?

1)	448cm2	2)	464cm2
3)	486cm2	4)	524cm2
5)	None of these

Q28.	The length of a rectangle increases by 20% and also  its breadth increases by 15% . What should be the percentage change in its perimeter?

1)	35%	2)	36%
3)	38%	4)	Can't be determined
5)	None of these

Q29.	A is 25% more efficient than B and 50% more efficient than  C. A and B together can complete a work in 20 days. How many days the same work  can be completed by B and C if both work  in alternate days and B starts  the work  first  ?

1)	48 days	2)	49 days
3)	50 days	4)	51 days
5)	None of these

Q30.	A person invested an amount of Rs. 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in 2 years be Rs. 3508, what was the amount invested in Scheme B ?

1)	Rs.6400	2)	Rs.6500
3)	Rs.7200	4)	Rs.7500
5)	None of these