Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q71.  Directions : Study the graphs carefully to answer the questions that follow: Total number of children in six different schools and the percentage of girls are give bellow in the linechart. The numbers of boys in school Q is how much percentage (approx.) more or less than the numbers of girls in the school S ? 
1)  140  2)  142 
3)  144  4)  148 
5)  None of these 
Answer : 142
Explanation : The numbers of boys in school Q = (3000 x 55/100) = 1650
Explanation : The numbers of boys in school Q = (3000 x 55/100) = 1650
The numbers of girls in the school S = (2250 x 30/100) = 675
So, different = 1650  675 = 975
Therefore , required more % = (975/675) x 100 = 144 % (approx.)
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Q72.  Directions : Study the graphs carefully to answer the questions that follow: Total number of children in six different schools and the percentage of girls are give bellow in the linechart. What is number of boys in school P and Q are more than girls in school of S and T ? 
1)  1475 more  2)  1655 less 
3)  1875 more  4)  1975 more 
5)  None of these 
Answer : 1975 more
Explanation : Total number of boys in school P and Q = [ (2500 x 60/100) + (3000 x 55/100) ] =1500 + 1650 = 3150.
Explanation : Total number of boys in school P and Q = [ (2500 x 60/100) + (3000 x 55/100) ] =1500 + 1650 = 3150.
Total number of girls in school S and T = [ (2250 x 30/100) + (1250 x 40/100) ] = 675 + 500 = 1175
So, the different = 3150 1175 = 1975
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Q73.  Directions : Study the graphs carefully to answer the questions that follow: Total number of children in six different schools and the percentage of girls are give bellow in the linechart. What is the total number of boys in School S ? 
1)  675  2)  1250 
3)  1475  4)  1575 
5)  None of these 
Answer : 1575
Explanation : Given ,total numbers of children is 2250 and percentage of girls 30.
Explanation : Given ,total numbers of children is 2250 and percentage of girls 30.
So, percentage of boys = 2250 x 70/100 = 1575
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Q74.  Directions : Study the graphs carefully to answer the questions that follow: Total number of children in six different schools and the percentage of girls are give bellow in the linechart.What is the average number of boys in schools P and Q together ? 
1)  1365  2)  1475 
3)  1575  4)  1625 
5)  None of these 
Answer : 1575
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Q75.  Directions : Study the graphs carefully to answer the questions that follow: Total number of children in six different schools and the percentage of girls are give bellow in the linechart. What is the ratio of the number of girls in school Q to the number of girls in school P ? 
1)  20 : 27  2)  20 : 23 
3)  27 : 20  4)  D.I 
5)  17 : 20 
Answer : 27 : 20
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Q76. 

1)  162/3%  2)  25% 
3)  331/3%  4)  35% 
5)  None of these 
Answer : 331/3%
Explanation : A’s investment in 2004 is Rs. 80 lakh.
Explanation : A’s investment in 2004 is Rs. 80 lakh.
A’s investment in 2003 is Rs. 60 lakh.
So, percentage rise = [(80  60)/60] x100 = 33.33%
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Q77. 

1)  15%  2)  162/3% 
3)  18%  4)  20% 
5)  None of these 
Answer : 162/3%
Explanation : The investment of B in 2001 is 60 lakh and investment in 2004 is 70 lakh .
Explanation : The investment of B in 2001 is 60 lakh and investment in 2004 is 70 lakh .
So, % increased = [(70  60)/60] x 100 = 100/6 = 50/3 =16.66%
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Q78. 

1)  4 years  2)  6 years 
3)  8 years  4)  12 years 
5)  None of these 
Answer : 6 years
Explanation :
Explanation :
Mother's age when Prasant's brother was born = 46 years.
Father's age when Prasant's brother was born = (48 + 4) years = 52 years.
Required difference = (52  46) years = 6 years.
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Q79. 

1)  16 years  2)  18 years 
3)  20 years  4)  24 years 
5)  None of these 
Answer : 20 years
Explanation :
Explanation :
Let, the present ages of Alok and Prakash be x and (60 x) years respectively.
Then, (60  x)  6 = 5(x  6)
54  x = 5x  30
or 6x = 84
or x = 14.
So, Prakash's age after 6 years = (x+ 6) = 20 years.
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Q80. 

1)  14 years  2)  19 years 
3)  24 years  4)  28 years 
5)  None of these 
Answer : 19 years
Explanation :
Explanation :
Let, B's present age be x years. Then, (48  x) = x
Or 2x = 48.
Or x = 24.
B's age 5 years back (24  5) = 19 years.
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