Question 1119905
{{{system(n+d+q=54,0.05n+0.1d+0.25q=7,0.1n+0.05d+0.25q=6)}}}


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{{{system(n+d+q=54,n+2d+5q=140,2n+d+5q=120)}}}



E2 and E3 mean  {{{d-n=20}}}.


Substitute for d:
{{{system(2n+q=34,3n+5q=100)}}}


{{{system(10n+5q=170,3n+5q=100)}}}


{{{7n=70}}}


{{{highlight(n=10)}}}--------------ten nickels.

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{{{highlight(d=30)}}}---------------dimes, 30
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{{{highlight(q=14)}}}-------------14 quarters