<PRE><B>Question 1045964</B>
Account for how many coins.
Account for the money.
Transcribe the other described statements.
Solve the system of equations   --- you need only three equations for the three unknown n, d, q.   Be sure the information all matches.



{{{system(n+d+q=weDoNotKnow,0.05n+0.1d+0.25q=25.5,d=n+10,q/d=2)}}}


A coin count is not given; most coin combination problems do give a coin count.



The system is equivalent to this one:
{{{system(n+2d+5q=510,d=n+10,q=2d)}}}

You know what to do now; right?</PRE>