Question 390979
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Hi, 
she will combine to get a 16 oz. mixtur       
Let x and (16oz-x) represent the 65% and 25% types respecrtively
Question States***
combining to form the 50%  mixture
 .65x + .25(16oz-x) = .50*16oz
      .40x = .25/16oz
         x = .25*16oz/.40
         x = 10oz,  the amount of the 65% type.  6oz of the 25% type  (16-6)

CHECKING our Answer***
  .65*10oz + .25*6oz =  6.5oz + 1.5oz = .50*16oz = 8oz