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Monday, March 4, 2013

Civil Service Commission Professional or Sub-Professional Reviewer - Page 104/159

Mathematics Test IV Solution - Page 104

47. A horse is tied to a pole with a rope of 7 meters long. How much grazing area does it have?
(use π = 22 / 7).

Area = π r2
        = π (7m)2
        =  22  (49m2)
             7 
        = 22 (7m2)
        = 154m2 * Ans.

48. What number is missing in this sequence : 5, 7, 11, 17, ________ ?

5 + 2 = 7
7 + 4 = 11
11 + 6 = 17
17 + 8 = 25

therefore, 25 is the * Ans.

49. How many two-digit numbers can be formed from the digits 1, 2, 3, 4, and 5 if a digit cannot be used more than once?

5  -  the five numbers can be used
4  -  only four of the numbers can be used since repetition of the digits is not allowed

5 x 4 = 20

therefore, 20 numbers * Ans.

50. What is the value of x in 5 : x = x : 125 ?

5 : x = x : 125
x (x) = 5 (125)
x2 = 625
        _____
x = √ 625
x = 25 * Ans.

51. If one bilao of pansit guisado serves 7 people, how many bilaos are needed to serve a banquet of 126 people?

N = no. of bilaos needed to serve 126 people

N : 126 = 1 : 7
N (7) = 126 (1)
7N = 126
  N = 126 / 7
  N = 18 * Ans.


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