Set up the augmented matrix that describes the situation, and
solve for the desired solution.
A bag of mixed nuts contains cashews, pistachios, and almonds.
Originally there were 850 nuts in the bag. 30% of the almonds, 20%
of the cashews, and 10% of the pistachios were eaten, and now there
are 715 nuts left in the bag. Originally, there were 50 more
cashews than almonds. Figure out how many of each type of nut was
in the bag, to...