Mathmetics

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

Q531.
If the number 517 * 324 is completely divisible by 3, then the smallest whole number in the place of * will be:

1) 0 2) 1
3) 2 4) 3
5)None of these
Answer : 2
Explanation : Explanation:
    Sum of digits = (5 + 1 + 7 + x + 3 + 2 + 4) = (22 + x),   which is not must be divisible by 3.
     So, x = 2.
View Answer

Q532.
The sum of two number is 25 and their difference is 13. Find their product.
1) 104 2) 114
3) 315 4) 325
5)None of these
Answer : 114
Explanation : Explanation:

    Let the numbers be x and y.
    Then, x + y = 25 and x - y = 13.
    4xy = (x + y)2 - (x- y)2  = (25)2 - (13)2
     = (625 - 169) = 456
   So,  xy = 114.
View Answer

Q533.
Find the two natural numbers whose sum is 85 and the LCM is 102
         

1) 1) 30 and 55 2) 2) 17 and 68
3) 3) 35 and 55 4) 4) 51 and 34
5)5) None of these
Answer : 4) 51 and 34
View Answer

Q534.
The H.C.F. of two numbers is 11 and their L.C.M. is 693. If one of the numbers is 77, find the other.
                
1) 1) 909 2) 2) 119
3) 3) 66 4) 4) 99
5)5) None of these
Answer : 4) 99
View Answer

Q535.
A boat running downstream covers a distance of 24 kms in 4hrs while for covering the distance upstream it takes 6 hrs. What is the speed of the boat in still water ?
1) 5.5 km/hr 2) 6 km/hr
3) 3.5 km/hr 4) 4.5 km/hr
5)None of these
Answer : None of these
Explanation :  Ans. 5 km/hr
View Answer

Q536.
23 x 15 / 25 + 48.2 = -35 + ?
1) 97 2) 98
3) 95 4) 96
5) None of these
Answer : 97
View Answer

Q537.
(562 - 754) /6 = ? / (-5)
1) -120 2) 120
3) -160 4) 160
5)None of these
Answer : 160
View Answer

Q538.
5/11 of 55% of 1500 ?
1) 395 2) 392
3) 375 4) 372
5)None of these
Answer : 375
View Answer

Q539.
(35.2 x 15 x 4) / 12 + 20 = (?)2
1) (14)2 2) 14
3) 16 4) (14)1/2
5)None of these
Answer : 14
View Answer

Q540.
(3 x 4)2 x (3 x 6) / ( 9 x 5) = ?
1) 57.6 2) 59.6
3) 53.2 4) 51.2
5)None of these
Answer : 57.6
View Answer