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forsale [732]
3 years ago
11

. A baker purchased 12 lb of wheat flour and 15 lb of rye flour for a total cost of $18.30. A second purchase at the same prices

, included 15 lb of wheat flour and 10 lb of rye flour. The cost of the second purchase was $16.75. Find the cost per pound of the wheat flour and the rye flour.
Mathematics
2 answers:
mash [69]3 years ago
8 0
<span>w - amount of wheat purchased
r - amount of rye purchased 

12w+15r=18.30 /*2
15w+10r=16.75 /*3 

24w+30r=36.60, subtract this equation from the other one
45w+30r=50.25 


21w=13.65
w=13.65/21
w=0.65 is a cost per pound for wheat flour 

From the first equation we have
r=(18.30-12w)/15
r=(18.30-12*0.65)/15
r=0.70 is a cost per pound for rye flour</span>
Troyanec [42]3 years ago
8 0
It costs $0.70 per pound of wheat flour and the rye flour.
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