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@ @¶ìÿa@óÝy‹¾a@ u@                           @XT

. 60                     30 [MAΘ 1992]( )

 60      30

                                           .

         .                                           1 30
                                                    60
      .                                           1×1 = 1
                                                  60 30 1800
                 10   1     =  1
                           60            6              30

                   5                                          .
                                                    x . 20
                   6

.

                   .x + 30

                                            1

                                         1800

              .                                     x + 30    x + 30
      . x = 45
                                                    1800

                 20(x + 30) = 5
                           1800                6

                           20x + 600 = 1500

                                         20x = 900

                                            x = 45
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