The frist brand is 30% and the second on is 55% in order to obtain 30 gallons of mixture that contains 35% how many gallons of each brand must you usr

First Brand = 24 gallons, Second Brand = 6 gallons

Explanation:

                          Quantity         %           Qty (%)

First Brand              x              0.30          0.30x

Second Brand     30 - x        0.55          0.55(30 - x) = 16.5 - 0.55x

              Total       30        *    0.35     =     0.30x + 16.5 - 0.55x

                                            30(0.35)  =    16.5 - 0.25x

                                                10.5      =    16.5 - 0.25x

                                                -6.0      =            - 0.25x

                                                  24      =                      x

Second Brand: 30 - x   = 30 - 24   = 6

Y+8

Step-by-step explanation: