Question 369942
Let Q be the number of quarters, D dimes.
1.{{{Q=4+D}}}
2.{{{25Q+10D=345}}}
Substitute eq. 1 into eq. 2,
{{{25(4+D)+10D=345}}}
{{{100+25D+10D=345}}}
{{{35D=245}}}
{{{highlight(D=7)}}}
Then from eq. 1,
{{{Q=4+7}}}
{{{highlight(Q=11)}}}