Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q21. 

1)  12.5%  2)  17.5% 
3)  19%  4)  21% 
5)  None of these 
Answer : 19%
Explanation : Allegation Method:
Explanation : Allegation Method:
10% (C) x% (D)
15% (M)
(DM) = x15 (MC) = 15 10=5
So, x15 / 5 = 4/5
or x =15+4= 19%
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Q22. 

1)  288  2)  360 
3)  365  4)  435 
5)  None of these 
Answer : 365
Explanation : LCM of 6,8,9 and 10 is 360.
Explanation : LCM of 6,8,9 and 10 is 360.
So, total numbers of dozens of oranges are 360 +5 = 365
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Q23. 

1)  30  2)  31 
3)  32  4)  35 
5)  None of these 
Answer : 30
Explanation : HCF of 408 and 312 is 24.
Explanation : HCF of 408 and 312 is 24.
So, total numbers of sections = (408+312) /24 = 30
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Q24. 

1)  90 and 24  2)  120 and 24 
3)  120 and 54  4)  180 and 114 
5)  None of these 
Answer : 90 and 24
Explanation : The factors of 360 = 2 X 2 X 2 X 3 X 3 X 5
Explanation : The factors of 360 = 2 X 2 X 2 X 3 X 3 X 5
So, two numbers are 2 X 2 X 2 X 3 =24 and 2 X 3 X 3 X 5 = 90
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Q25. 

1)  Neither I nor II  2)  Either I or II 
3)  Both I and II  4)  Only II 
5)  Only I 
Answer : Either I or II
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Q26.  If x=2015, y=2014 and 2013 , then x^{2}+y^{2}+z^{2} xyyzzx = ? 
1)  2  2)  3 
3)  4  4)  6 
5)  None of these 
Answer : 3
Explanation : ATQ: x^{2}+y^{2}+z^{2} xyyzzx
Explanation : ATQ: x^{2}+y^{2}+z^{2} xyyzzx
= x^{2}xy+y^{2} yz+z^{2}zx
= x(xy) + y((yz) + z(zx)
= 2015(20152014) + 2014(20142013)+2013(20132015)
= 2015 + 2014 + 4026
=40294026 =3
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Q27. 

1)  12.25  2)  11.5 
3)  11.125  4)  12.5 
5)  None of these 
Answer : None of these
Explanation : x .5, x1.5, x 2.5, x 3.5 , x 4.5 and so on
Explanation : x .5, x1.5, x 2.5, x 3.5 , x 4.5 and so on
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Q28. 

1)  31  2)  39 
3)  45  4)  49 
5)  None of these 
Answer : 49
Explanation : x 2 1, x 32, x 43, x 5 4 and so on ...
Explanation : x 2 1, x 32, x 43, x 5 4 and so on ...
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Q29. 

1)  175  2)  196 
3)  208  4)  244 
5)  None of these 
Answer : 244
Explanation : x 1+1^{2},, x 2+2^{2}, x 3+3^{2}, x 4+4^{2} and so on ....
Explanation : x 1+1^{2},, x 2+2^{2}, x 3+3^{2}, x 4+4^{2} and so on ....
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Q30. 

1)  34  2)  46 
3)  70  4)  76 
5)  None of these 
Answer : 46
Explanation : x 2 +6 , x 2+6 , and so on
Explanation : x 2 +6 , x 2+6 , and so on
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