SOLUTION: snookers lumber can convert logsinto either lumber or plywood. In a given day, the mill turns out thre times as mny units of plywood as lumber. It makes a profit of $30 on a unit o

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Question 241880: snookers lumber can convert logsinto either lumber or plywood. In a given day, the mill turns out thre times as mny units of plywood as lumber. It makes a profit of $30 on a unit of lumber and $40 on a unit of plywood. Howmany of each must be produced and sold in orer to make a profit of $15,600?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let a = units/day of lumber needed
Let b = units/day of plywood needed
given:
(1) b+=+3a
(2) 30a+%2B+40b+=+15600
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Substitute (1) in (2)
(2) 30a+%2B+40%2A%283a%29+=+15600
30a+%2B+120a+=+15600
150a+=+15600
a+=+104
b+=+3a
b+=+3%2A104
b+=+312
104 = units/day of lumber needed
312 = units/day of plywood needed