Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q31. 

1)  146  2)  162 
3)  166  4)  184 
5)  None of these 
Answer : None of these
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Q32. 

1)  15  2)  18 
3)  25  4)  36 
5)  None of these 
Answer : 15
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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Q33. 

1)  13  2)  14.5 
3)  15.5  4)  16 
5)  None of these 
Answer : 14.5
Explanation : +7 x 1/2 , +6 x 2 , + 5 x 1/2, + 4 x 2, so on
Explanation : +7 x 1/2 , +6 x 2 , + 5 x 1/2, + 4 x 2, so on
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Q34. 

1)  839  2)  738 
3)  829  4)  938 
5)  None of these 
Answer : 839
Explanation : x 5 + 5^{2} , x 4 + 4^{2} , x 3 +3^{2}
Explanation : x 5 + 5^{2} , x 4 + 4^{2} , x 3 +3^{2}
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Q35. 

1)  4.125  2)  5.25 
3)  6.75  4)  4.125 
5)  None of these 
Answer : 4.125
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Q36.  A person divide his capital worth Rs.4332 into three parts in such way their interest after 2,3 and 4 years equal to each other. The rate of interest on these three parts have to be 4% , 7% and 11% per annum, respectively at S.I. What is the difference between the largest and the smallest part of money invested ? 
1)  Rs.1860  2)  Rs.2052 
3)  Rs.2268  4)  Rs.2468 
5)  None of these 
Answer : Rs.2268
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Q37.  The rate of SI in bank A and bank B are in the ratio is 6:7. A businessman wants to deposits his total savings in these two banks in such a way that he received equal quarterly interest from both the banks.What should be his ratio of saving in bank A to bank B ? 
1)  3:4  2)  4:5 
3)  6:7  4)  7:6 
5)  None of these 
Answer : 7:6
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Q38.  The simple interest per annum on an amount of Rs.17,000 at the end of four years is Rs.6800. What would be the compound interest on the same amount at the same rate after 2 years ? 
1)  Rs.3240  2)  Rs.3470 
3)  Rs.3570  4)  Can'not be determined 
5)  None of these 
Answer : Rs.3570
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Q39.  The ratio between A's and Bs salary was 3:4,two year ago . The ratio's of individual salaries of A and B two year's ago and this year's salaries are 4:5 and 2:3 respectively. At present the total of their salary is Rs.4290. What is present salary of A ? 
1)  Rs.1560  2)  Rs.1600 
3)  Rs.1650  4)  Rs.1840 
5)  None of these 
Answer : Rs.1650
Explanation :
Explanation :
Let, two year ago ,the ratio of between A'and B's salary was 3x: 4x respectively.
The ratio of their individual salary between two years ago and this year is 4y:5y and 2z:3z respectively.
So, 4y = 3x (A's last year salary)
or y = .75x and 2z = 4x (B's last year salary)
or z = 2x
Now, the total of their salary is Rs.4290 .
So, 5y + 3z = Rs.4290
Replace y with .75x; replace z with 2x
So, 5(.75x) + 3(2x) = 4290
or 3.75x + 6x = Rs.4290 or 9.75x = 4290
or x = 4290/9.75 = 440
Then, A's present salary 3.75 (440) = Rs.1650
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Q40. 

1)  8 days  2)  10 days 
3)  12 days  4)  14 days 
5)  None of these 
Answer : 14 days
Explanation : Let, Bikas takes x days to finish the work . So, Alok would take (x +8) days to finish the same work.
Explanation : Let, Bikas takes x days to finish the work . So, Alok would take (x +8) days to finish the same work.
Given, Alok finishes 75% and Bikas finishes 25% work respectively.
So, (x+8)3/4 = (x/4)+9
or (3x+24)/4 = (x+36)/4
or 2x = 12
or x = 6
Therefore, Alok would finishes the work (6+8) = 14 days alone.
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