J.R. S. answered 08/17/17
Tutor
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Ph.D. University Professor with 10+ years Tutoring Experience
Let T = lbs of Terraza and let G = lbs of Gazebo
Tx2.89 + Gx2.71 = 52x2.77
T + G = 52 and T = 52-G (substitute in equation 1)
(2.89)(52-G) + 2.71G = 144.04
150.28 - 2.89G + 2.71G = 144.04
0.18G = 6.28
G = 34.89 lbs of Gazebo = 35 lbs Gazebo
T = 52 - 34.89 = 17.11 lbs of Terraza = 17 lbs Terraza
OR you can do this by a method known as alliteration:
HAVE..........WANT..........NEED
2.89................................6...
..................2.77...................
2.71...............................12....
So, you need to use 6 parts of the 2.89/lb and 12 parts of the 2.71/lb for a total of 18 parts
Since you want 52 pounds total, 18 parts thus is equal to 52 lbs and 1 part = 52/18 = 2.89 lbs
2.89 lbs x 6 parts = 17 lbs of Terraza
2.89 lbs x 12 parts = 35 lbs of Gazebo