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Tuesday, March 5, 2013

Civil Service Commission Professional or Sub-Professional Reviewer - Page 80/159

Mathematics Test II Solution - Page 80

46. If it takes 16 pipes 10 hours to fill 8 tanks, how long will it take 12 pipes to fill 9 tanks?

Let H be the number of hours

H =  (16)(10)   pipe - hours  x  9 tanks 
              8               tanks        12 pipes

    =  16 x 10 x 9 
            8 x 12

    =  1440 
          96

    = 15 hours *Ans.

47. Mr. Cruz borrows $360,000. If he pays back $378,000 after one year, what is his interest rate?

I = F - P

I = $378,000 - $360,000 = 18,000

rate =  I  x 100%
         Pt

      =  $18,000  x 100%
        $360,000

     = 5% *Ans.

48. If 6 men need $3,600 worth of food for a three-day camping trip, how much will 2 men need for a 15-day trip?

Let x - be the worth if food needed by 2 men for a 15-day trip

x =  $3,600  x (2 x 15 man-days)
        6 x 3

   =  $3,600 x 30 
               18

   = 200 x 30

   = $6,000 *Ans.

49. What is 6% of 2.5 ?

6% of 2.5

=   6   x  25 
   100     10

=  150 
   1000

= 3 / 20 * Ans.

50. What is the value of 60 x 31 x 36 x 7 ?

In this kind of problem we don't need to multiply in order to get the answer. Notice in the choices that the first five digits are all the same so we just have to check what the last digit be This can be done by multiplying the last digit :

0 x 1 x 6 x 7 = 0

Therefore, the answer is : 468, 720 *Ans.


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