SOLUTION: I'm probably making this seem harder than it looks, but my course papers involve this example of rearranging an equation to make an unknown the subject. This is the question in

Question 341397: I'm probably making this seem harder than it looks, but my course papers involve this example of rearranging an equation to make an unknown the subject.
This is the question in full.
The surface area (A) of a rectangular prism is given by the formula:
A=2(bh+hl+lb)
Evaluate b when A=11750sq mm; h=25mm and l=75mm
I know the idea is to make b the subject first by rearranging, but I'm having difficulty coming to how to rearrange this formula without changing it beyond its function.
Please help!
Thanks
Craig Jenkins (supposed engineering student.)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A=2(bh+hl+lb)
Evaluate b when A=11750sq mm; h=25mm and l=75mm
---------------------
11750 = 2(b*25 + 25*75 + 75b)
5875 = 25b + 1875 + 75b = 100b + 1875
100b = 4000
b = 40 mm

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