Question 343930
Total number of coins
1.{{{D+Q=84}}}
Total value of coins (in cents)
{{{10D+25Q=1500}}}
2.{{{2D+5Q=300}}}
Multiply eq. 1 by (-2) and add it to eq. 2,
{{{-2D-2Q+2D+5Q=-168+300}}}
{{{3Q=132}}}
{{{highlight(Q=44)}}}
Then from eq. 1,
{{{D+44=84}}}
{{{highlight(D=40)}}}
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Forty dimes and forty four quarters.