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.

Question

Romeo Knapp

Mathematics

3 September, 15:47

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.

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Answers (1)

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Wyatt Mack · Answer 1

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