Mathmetics

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

Q591.
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.
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Q592.
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
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Q593.
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
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Q594.
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
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Q595.
23 x 15 / 25 + 48.2 = -35 + ?
1) 97 2) 98
3) 95 4) 96
5) None of these
Answer : 97
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Q596.
(562 - 754) /6 = ? / (-5)
1) -120 2) 120
3) -160 4) 160
5)None of these
Answer : 160
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Q597.
5/11 of 55% of 1500 ?
1) 395 2) 392
3) 375 4) 372
5)None of these
Answer : 375
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Q598.
(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
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Q599.
(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
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