Question 1103568
q and d
{{{system(q+d=18,25q+10d=330)}}}


{{{5q+2d=66}}}



Multiply the coin count equation by 2.

This is that system:
{{{system(5q+2d=66,2q+2d=36)}}}


Continue one-step into Elimination Method.
{{{3q=30}}}
{{{highlight(q=10)}}}------------ten quarters
therefore {{{highlight(d=8)}}}---------eight dimes