Question 889185
n+d+q=51;
n=-5+3(d+q);
0.05n+0.10d+0.25q=4.15.


Simplify two of the equations.
n=-5+3d+3q
n-3d-3q=-5.
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n+2d+5q=83.


Solve the system:
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n+d+q=51
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n-3d-3q=-5
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n+2d+5q=83
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One method to start can be add three times the "51" equation to the second equation and quickly get a value for n.