Assume this:
A is the greater number
B is the lesser
You have 2 equations
A + B = 20
A = 3xB - 4
Substitute the solution for the second eqation into the first
(3xB - 4 ) + B = 20
solve for B
3xB + B = 20 + 4
4xB = 24
B = 6
solve for A with solution for B
go back to equation 2
A = 3xB - 4
A = 3x6 - 4
A = 14
So A = 14
and B = 6
Otherwise use trial and error.
Hope that helps.
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