SOLUTION: Hi, I am struggling with an application problem that has to deal with mixtures. To make a flour mixture, a miller combined soybeans that cost $8.50 per bushel with wheat that c

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Question 839264: Hi, I am struggling with an application problem that has to deal with mixtures.
To make a flour mixture, a miller combined soybeans that cost $8.50 per bushel with wheat that cost $4.50 per bushel. How many bushels of each were used to make a mixture of 800 bushels costing $5.50 per bushel?

Found 2 solutions by josmiceli, ankor@dixie-net.com:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = bushels of soybeans needed
Let +b+ = bushels of wheat needed
+8.5a+ = cost of +a+ bushels of soybeans
+4.5b+ = cost of +b+ bushels of wheat
----------------------------------------
(1) +a+%2B+b+=+800+
(2) +%28+8.5a+%2B+4.5b+%29+%2F+800+=+5.5+
-------------------------------
(2) +8.5a+%2B+4.5b+=+5.5%2A800+
(2) +8.5a+%2B+4.5b+=+4400+
(2) +85a+%2B+45b+=+44000+
(2) +17a+%2B+9b+=+8800+
Multiply both sides of (1) by +9+
and subtract (1) from (2)
(2) +17a+%2B+9b+=+8800+
(1) +-9a+-+9b+=+-7200+
+8a+=+1600+
+a+=+200+
and, since
(1) +a+%2B+b+=+800+
(1) +200+%2B+b+=+800+
(1) +b+=+600+
200 bushels of soybeans are needed
600 bushels of wheat are needed
---------------------------------
check:
(2) +%28+8.5a+%2B+4.5b+%29+%2F+800+=+5.5+
(2) +%28+8.5%2A200+%2B+4.5%2A600+%29+%2F+800+=+5.5+
(2) +%28+1700+%2B+2700+%29+%2F+800+=+5.5+
(2) +4400+=+5.5%2A800+
(2) +4400+=+4400+
OK

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
To make a flour mixture, a miller combined soybeans that cost $8.50 per bushel with wheat that cost $4.50 per bushel.
How many bushels of each were used to make a mixture of 800 bushels costing $5.50 per bushel?
:
Let x = amt of soybean meal
the final total is to be 800 bu, therefore:
(800-x) = amt of wheat flour required
:
The mixture equation
8.50x + 4.50(800-x) = 5.50(800)
8.5x + 3600 - 4.5x = 4400
8.5x - 4.5x = 4400 - 3600
4x = 800
x = 800/4
x = 200 bu of soy meal
then
800 - 200 = 600 bu of wheat flour