Question 1200476
{{{system(n+d+q=76,5n+10d+25q=850,d/n=2)}}}----------literally the meaning of the description.


Some simplification of the system:


{{{system(n+d+q=76,n+2d+5q=170,d=2n)}}}


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n=21
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d=42
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q=13


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Possible Method, not the one used:

{{{system(2n+2d+2q=152,2n+4d+10q=340,2n=d)}}}


{{{system(d+2d+2q=152,d+4d+10q=340)}}}


{{{system(3d+2q=152,5d+10q=340)}}}


{{{system(3d+2q=152,d+2q=68)}}}

Subtract second eq. from first eq.

{{{2d=84}}}

{{{highlight(d=42)}}}