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21. The average of 6 numbers is 40.If each of the first three numbers is increased by 4 and each of the remaining three numbers is decreased by 6,then the new average is
  A.  36
  B.  30
  C.  39
  D.  42
     
   
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22. Nikhil is 8 years younger than his brother Rohan.How old will Rohan be when he is twice as old as Nikhil ?
  A.  4 years
  B.  6 years
  C.  8 years
  D.  16 years
     
   
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23. A man is 3 years older than his wife and four times as old as his son.If the son becomes 15 years old after 3 years,then what is the present age of the wife?
  A.  45 years
  B.  51 years
  C.  48 years
  D.  60 years
     
   
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24. The age of Dr.Pandey is four times the age of his son.After 10 years,the age of Dr.Pandey will be twice the age of his son.The present age of Dr.Pandey's son is
  A.  4 years
  B.  5 years
  C.  6 years
  D.  8 years
     
   
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25. 50 men can dig 40 holes in 30 days. How long will 25 men take to dig 20 holes?
  A.  15 days
  B.  22
1 / 2
days
  C.  45 days
  D.  30 days
     
   
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26. A man is engaged for planting trees for 10 hours. He plants 10 trees in an hour.He takes rest for 30 minutes after every hour.How many trees does he plant in 10 hours?
  A.  70
  B.  50
  C.  100
  D.  45
     
   
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27. If 4 cats can kill 4 rats in 4 minutes, how many minutes will it take 8 cats to kill 8 rats?
  A.  8
  B.  2
  C.  4
  D.  16
     
   
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28. It took 20 days for all the leaves of a tree to fall.if the numbers of the leaves that fell each day was twice that of the previous day,on which day would the tree be half bare?
  A.  10th day
  B.  19th day
  C.  40th day
  D.  11th day
     
   
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29. If 324 × 150 = 54, 251 × 402 = 48 and 523 × 246 = 120 then 651 × 345 = ?
  A.  120
  B.  85
  C.  60
  D.  144
     
   
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30. Some equations are solved on the basis of certain system. Find out the correct answer for the unsolved equation on that basis.

If 12 × 7 = 408 and 9 × 8 = 207 then 13 × 7 = ?
  A.  190
  B.  91
  C.  109
  D.  901
     
   
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