Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q81. 

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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Q82. 

1)  Rs.17000  2)  Rs.17500 
3)  Rs.18000  4)  Rs.18500 
5)  None of these 
Answer : Rs.17500
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Q83. 

1)  1:2  2)  1:3 
3)  3:4  4)  2:5 
5)  None of these 
Answer : 1:3
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Q84. 

1)  50%  2)  60% 
3)  70%  4)  80% 
5)  None of these 
Answer : 80%
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Q85. 

1)  6:5  2)  7:5 
3)  8:5  4)  9:5 
5)  None of these 
Answer : 7:5
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Q86.  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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Q87. 

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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Q88. 

1)  1/3  2)  1/4 
3)  1/2  4)  No change 
5)  None of these 
Answer : 1/2
Explanation :
Explanation :
Let the length and breadth of the rectangle be L and B respectively.
Area = L x B = LB
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Q89.  If (1^{3}+2^{3}+3^{3}+4^{3}+ 5^{3}+6^{3}+................+10^{3}) = 3025 ,then find the value of (2^{3}+4^{3}+6^{3}+8^{3}+ 10^{3}+...............+20^{3}) 
1)  6050  2)  10060 
3)  12040  4)  24200 
5)  None of these 
Answer : 24200
Explanation : We can express , (2^{3}+4^{3}+6^{3}+8^{3}+ 10^{3}+...............+20^{3}) =
Explanation : We can express , (2^{3}+4^{3}+6^{3}+8^{3}+ 10^{3}+...............+20^{3}) =
2^{3} x (1^{3}+2^{3}+3^{3}+4^{3}+ 5^{3}+6^{3}+................+10^{3}) = 8 x 3025 = 24200
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Q90.  Given that, (1^{2}+2^{2}+3^{2}+4^{2}+ 5^{2}+6^{2}+7^{2}) = x +1 , the find the value of the following expressions: 
1)  2(x+1)  2)  4(x+1) 
3)  8(x+2)  4)  16(x+1) 
5)  None of these 
Answer : 4(x+1)
Explanation : We can write, (2^{2}+4^{2}+6^{2}+8^{2}+10^{2}+12^{2}+ 14^{2}) = 2^{2} x (1^{2}+2^{2}+3^{2}+4^{2}+ 5^{2}+6^{2}+7^{2}) = 4(x+1)
Explanation : We can write, (2^{2}+4^{2}+6^{2}+8^{2}+10^{2}+12^{2}+ 14^{2}) = 2^{2} x (1^{2}+2^{2}+3^{2}+4^{2}+ 5^{2}+6^{2}+7^{2}) = 4(x+1)
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