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Tuesday, March 5, 2013

Civil Service Commission Professional or Sub-Professional Reviewer - Page 75/159

Mathematics Test II Solution - Page 75

25. A boy spent $320, which was 5/7 of what he had originally. How much did he have originally?

Let x - be the original amount of money that the boy had first.

 5 x = $320
 7

x = 320 ( 7 )
               5

x = $448 *Ans.

26. 0.0075 x 1000 = ___________?

To multiply numbers by 10n, move the decimal point of the number to n places to the right.

0.0075 x 1000 = 0.0075 x 103               n = 3 this represents the no. of zero decimals : move the
                        = 7.5 *Ans                      decimal point 3 places to the right.

27. Express 0.572 as a common fraction in lowest term?

0.572 =  527              0.572 - this has 3 decimal places remove the decimal point and
             1000                          replace it by the denominator of 103 = 1000.

=  572 / 4 
   1000 / 4

=  143  *Ans.
    250

28. Of the following which is the closest approximation to the product 0.33 x 0.41 x 0.625 x 0.83 = _____?

0.33   = 1/3
0.41   = 2/5
0.625 = 5/8
0.83   = 5/6

=  1 x 2 x 5 x 5 
    3 x 5 x 8 x 6

=  50 
   720

= 5 / 72 *Ans.

Civil Service Reviewer Post 75/159