Question 435249
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Hi
making 10 tons of concrete
Let x and (10-x) represent the amount of 65% and 17% cement mixtures respectively
Question states***Mixing to form 10 tons of 36.2% mixture
  .65x + .17(10-x) = .362*10
     .48x = .192*10
        x = .192*10/.48
        x = 4 tons of the 65% mixture needed

CHECKING our Answer***
.65*4  + .17*6 = 3.62