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21. The sum of the digits of a two-digit number is 8. If the digits are reversed, the number is decreased by 54. Find the number.
  A.  71
  B.  70
  C.  72
  D.  73
     
   
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22. In a two-digit number the digit in the unit's place is more than the digit in the ten's place by 2. if the difference between the number and the number obtained by interchanging the digits is 18. What is the original number.
  A.  20
  B.  Data Inadequate
  C.  18
  D.  36
     
   
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23. If the sum of a number and its square is 182, what is the number?
  A.  11
  B.  12
  C.  13
  D.  14
     
   
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24. The sum of the digits of a two-digit number is 8. If the digits are reversed, the number is increased by 54. Find the number.
  A.  15
  B.  16
  C.  17
  D.  18
     
   
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25. If 40% of a number is 360, what will be 15% of 15% of that number?
  A.  20.25
  B.  25.20
  C.  15.25
  D.  25.15
     
   
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26. The ratio of the sum and the difference of two number is 7:1. Find the ratio of those two numbers.
  A.  3:4
  B.  4:5
  C.  3:5
  D.  4:3
     
   
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27. The difference between a two-digit number and the sumber obtained by interchanging the digits is 27. What are the sum and the difference of the two digits of the number?
  A.  3
  B.  2
  C.  4
  D.  5
     
   
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28. The difference between the digits of a two-digit number is one-ninth of the difference between the original number and number obtained by interchanging the positions of the digits. What definitely is the sum of the digits of that number?
  A.  Data Inadequate
  B.  20
  C.  30
  D.  10
     
   
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29. The sum of the digits of a two-digit number is
1 / 11
of the sum of the number and the number obtained by interchanging the position of the digits. What is the difference between the digits of that number?
  A.  33
  B.  Data Inadequate
  C.  22
  D.  11
     
   
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30. The sum of the digits of a two-digit number is
1 / 5
of the difference between the number and the number obtained by interchanging the positions of the digits. What definitely is the difference between the digits of that number?
  A.  3
  B.  7
  C.  9
  D.  5
     
   
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