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If B = 10, T = 5 and S = 3
Then:
B + T = 15
5T  S = 22
BTS = 150
S + S + S = 10T  41
Have you included a variety of equations?
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Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=August18
Here is the URL which will take them to a self marking exercise on substitution.