<PRE><B>Question 106094</B>
a person takes three daily vitamins supplement,B,C and E, via three types of pills, regular, extra-strenght, and fortified. 
Each regular pills contains 10 units of B, 20 units of C, and 20 units of E.
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Each extra-str pill contains 20 units of B, 60 units of C, and 10 units of E.
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Each fortified pill contains 10 units of B, 20 units of C, and 40 units of E.
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How many pills of each type should be in order to achieve 50units of B, 120 units of C, and 90 units of E? 

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Let x,y,and z be the number of regular,extra-str. and fortified pills.
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B equation: 10x + 20y + 10z = 50
C equation: 20x + 60y + 20z = 120
E equation: 20x + 10y + 40z = 90 
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I used a TI caluculator to get x = 2 ; y = 1, z = 1
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Cheers,
Stan H.</PRE>