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Tuesday, March 5, 2013

Civil Service Commission Professional or Sub-Professional Reviewer - Page 79/159

Mathematics Test II Solution - Page 79

41. If 3/8 of a certain number is 2/5, what is 3/4 of that same number?

 3 x =  2 
 8        5

    x =  2  ( 8 )
           5     3

    x =  16 
           15

 3  x  =  3  ( 16 )
 4          4    15

 3  x  =  4  *Ans.
 4          5

42. A bus travels 240 kilometers at 60 kph and then returns at 40 kph. What is the average speed in kilometers per hour for the round trip?

t1 = distance / rate
    = 240 km / 60 kph
    = 4 hrs.

t2 = distance / rate
    = 240 km / 40 kph
    = 6 hrs.

rate =  total distance 
              total time

       =  240 + 240 
               4 + 6

       =  480 
            10

       = 48 km/hr *Ans.

43. Mr. Albelda drives his car at the rate of 60 miles per hour. What is his rate in feet per second?

5280 ft. = 1 mile

rate = 60  mi  x      1 hr      x  5280 ft
                hr      3600 sec      1 mile

       =  60 (5280)    ft  
               3600      sec

       = 88  ft  *Ans.
              sec

44. What is 0.05 percent of 6.5 ?

= 0.05% x 6.5

= 0.0005 x 6.5

= 0.00325 * Ans.


45. At Rosa Alvero Street, in Loyola Heights there are 8 towns houses and 52 private individual homes. What is the ratio of town houses to private individual homes?

 8  =   8 /  4 
52     52 / 4

     = 2 / 13 or 2 : 13 * Ans.

Civil Service Reviewer Post 79/159