Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q11. 

1)  26  2)  27 
3)  41  4)  56 
5)  None of these 
Answer : 41
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Q12. 

1)  2420  2)  2880 
3)  3260  4)  4840 
5)  None of these 
Answer : 2880
Explanation :
Explanation :
Treating the group of four vowels (E, I O and U) as one distinct letter then total number of letters will be 8  4 + 1 = 5 [i.e. P, R, V, S and (E, I, O, U)].
The five letters can be arranged in 5! = 120 ways The vowels among themselves can be arranged in 4! = 24 ways,
The letters of the word ‘PREVIOUS’ can be arranged in 120 × 24 = 2880 ways such that vowels always come together.
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Q13. 

1)  Rs.5750  2)  Rs.6400 
3)  Rs.6090  4)  Rs. 7500 
5)  None of these 
Answer : Rs.6090
Explanation :
Explanation :
Short Cut Methods:
C.P = 600/(2515) x 100 = 6000
So, S.P = 6000 x 115/100 = Rs.6900
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Q14. 

1)  200 litre  2)  250 litre 
3)  300 litre  4)  400 litre 
5)  None of these 
Answer : 300 litre
Explanation : Let, the milkman buy x liter of milk.
Explanation : Let, the milkman buy x liter of milk.
He sells at at rupees 16 a liter.
SP_{1 }= Rs.16x, but losses Rs.600/
If he sells at 20 a liter, the SP_{2} = Rs.20x , but gains Rs.600/
Difference in SP = Rs.20x  Rs.16x = Rs.4x
Difference in actual SP = Rs.600 + Rs.600 = Rs.1200
So, 4x = 1200
or x = 1200/4 = 300
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Q15. 

1)  Rs.17000  2)  Rs.17500 
3)  Rs.18000  4)  Rs.18500 
5)  None of these 
Answer : Rs.17500
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Q16. 

1)  1:2  2)  1:3 
3)  3:4  4)  2:5 
5)  None of these 
Answer : 1:3
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Q17. 

1)  50%  2)  60% 
3)  70%  4)  80% 
5)  None of these 
Answer : 80%
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Q18. 

1)  6:5  2)  7:5 
3)  8:5  4)  9:5 
5)  None of these 
Answer : 7:5
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Q19.  When 20% of a number added to another number, the second number increases by its 50%. what is the ratio between two numbers ? 
1)  2:5  2)  5:2 
3)  2:3  4)  3:4 
5)  None of these 
Answer : 5:2
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Q20. 

1)  3 : 4  2)  21 : 11 
3)  11 : 25  4)  4 : 3 
5)  None of these 
Answer : 21 : 11
Explanation :
Explanation :
Let the side of the cube be ‘a’
Volume of the cube = a^{3}
Diameter of the sphere = a
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