﻿ Quantitative aptitude Question for all banking Bank PO,Clerk,IBPS PO,Railway,SSC,PSUs,IAS,OAS ,C-SAT Exams ﻿

### Mathmetics

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

##### Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.What will be the compound interest earned on an amount of Rs. 5000 in 2 years ?I. The simple interest on the same amount at the same rate of interest in 5 years is Rs.2000.      II. The compound interest and the simple interest earned in one year is the same.III. The amount become more than double on compound interest in 10 years.
 1) I only 2) I and II only 3) II and III only 4) I and III only 5) None of these
Answer : I only
Explanation :
Explanation:
P = Rs. 5000 & T = 2 years.
I. S.I. on Rs. 5000 in 5 years is Rs. 2000.
(5000 x R x 5)/100  = 2000   or       R = 8.
Thus I only gives the answer.
Correct answer is (1). View Answer
##### Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.       What is the area of the hall ? I. Material cost of flooring per square meter is Rs. 2.50 II. Labour cost of flooring the hall is Rs. 3500 III. Total cost of flooring the hall is Rs. 14,500.
 1) I and II only 2) II and III only 3) All I, II and III 4) Any two of the three 5) None of these
Answer : All I, II and III
Explanation :
Explanation:
I. Material cost = Rs. 2.50 per m2
II. Labour cost = Rs. 3500.
III. Total cost = Rs. 14,500.
Let the area be A sq. metres.
Material cost = Rs. (14500 - 3500) = Rs. 11,000.
5A/2 = 11000  or    A = (11000 x 2 )/5 = 4400 m2.
Thus, all I, II and III are needed to get the answer.
Correct answer is (3). View Answer
##### A person invested some amount at the rate of 12% simple interest and a certain amount at the rate of 10% simple interest. He received yearly interest of Rs. 130. But if he had interchanged the amounts invested, he would have received Rs.4 more as interest. How much did he invest at 12% simple interest ?
 1) Rs.400 2) Rs.500 3) Rs.700 4) Rs.800 5) None of these
Explanation :
Explanation :
Let the amount invested at 12% be x and the amount invested at 10% be y respectively

x x 12 x 1)/100 +( y x 10 x 1)/100 = 130
1.2x + y = 1300
Similarly, 1.2y + x = 1340
or (1.2x) x 1.2 + 1.2y = 1300 x 1.2
x +1.2y = 1340
or 0.44x = 1560 - 1340 = 220
or x = (220/0.44) - Rs. 500
or y = 1300 - 1.2 x 500 = Rs. 700 View Answer
##### A person invested some amount at the rate of 12% simple interest and a certain amount at the rate of 10% simple interest. He received yearly interest of Rs. 130. But if he had interchanged the amounts invested, he would have received Rs.4 more as interest. How much did he invest at 12% simple interest ?
 1) Rs.400 2) Rs.500 3) Rs.700 4) Rs.800 5) None of these
Explanation :
Explanation :
Let the amount invested at 12% be x and the amount invested at 10% be y respectively

x x 12 x 1)/100 +( y x 10 x 1)/100 = 130
1.2x + y = 1300
Similarly, 1.2y + x = 1340
or (1.2x) x 1.2 + 1.2y = 1300 x 1.2
x +1.2y = 1340
or 0.44x = 1560 - 1340 = 220
or x = (220/0.44) - Rs. 500
or y = 1300 - 1.2 x 500 = Rs. 700 View Answer
##### A cylindrical container of height 14 m and base diameter 12 m contains oil. This oil is to be transferred to one cylindrical can, one conical can and a spherical can. The base radius of all the containers is same. The height of the conical can is 6 m. While pouring some oil is dropped and hence only 3/4th of cylindrical can could be filled. How much oil is dropped ?
 1) 36 pie m3 2) 48 pie m3 3) 50 pie m3 4) 54 pie m3 5) None of these
Answer : 36 pie m3
Explanation :
Explanations:
Volume of the oil =  22/7x 62 x 14 = 504 x 22/7 m3.
Base radius of all the containers = 7 m
Volume of the spherical can = (4/3) x (22/7)x 63 m3.
Volume of the conical can =  (1/3) x (22/7) x 62 x 6 m3 = 72 x (22/7)
Balance oil = Volume of the cylindrical can
= 504 (22/7) - 288 (22/7)- 72(22/7) = 144(22/7) m3.
Oil dropped = 1/4 th of the cylindrical can
= 1/4x 144 = 36 (22/7) m3. View Answer
##### A hollow cone is cut by a plane parallel to the base and the upper portion is removed. If the curved surface area of the remainder is 8/9th of the curved surface of the whole cone, what should be the ratio of the line segments into which the cone’s altitude is divided by the plane is given by ?
 1) 2 : 3 2) 1 : 3 3) 1 : 2 4) 1 : 4 5) None of these
Answer : 1 : 2 View Answer
##### If 2x2 -7xy +3y2 = 0 ,then the value of x:y = ?
 1) 3:2 2) 2:3 3) 3:1 and 1:2 4) 5:6 5) None of these
Answer : 3:1 and 1:2
Explanation : Given, 2x-7xy +3y= 0
or 2(x/y)2-7(x/y)+ 3 = 0
So, x/y=3/1 and x/y=1/2 View Answer
##### If a,b and c are real numbers such that  a-b+c <1 , a+b+c >1 and 9a+3b+c < -4, then what is the sign of 'a'?
 1) + only 2) - only 3) + or - 4) Can't be said 5) None of these
Answer : - only View Answer
##### If a,b and c are the two roots of a quadratic equation such that a+b =24 and a-b = 8, the quadratic equation having a and b as its roots is ---.
 1) x2+2x+8=0 2) x2-4x+8=0 3) x2-24x+128=0 4) 2x2+8x+9=0 5) None of these
Explanation : Given, a+b =24 and a-b = 8
So,solving from two equations,we get a =16 and b=8
Therefore,ab=16 x 8 = 128
x2 - ( sum of roots)+ products of the roots = 0
or x2-24x+128 = 0 View Answer
##### What is the value of  'P' , if the following equation has two equal roots ?4x2 - (P-2)x + 1 = 0
 1) P=6 or P=-2 2) P=4 or P=-3 3) P=6 or P=-3 4) P=4 or P=2 5) None of these
Answer : P=6 or P=-2
Explanation : Here, a=4,b= - (P-2); c=1
Given, equation  has equal roots,then D=0

b2- 4ac =0
or p2 +4 - 4p - 16 = 0
or p2- 6p +2p - 12 =0
or p(p-6) + 2(p-2) = 0
or p=6 or -2 View Answer