Question 840913
1.{{{D+Q=23}}}
{{{0.10D+0.25Q=4.55}}}
2.{{{10D+25Q=455}}}
From eq. 1,
{{{10D+10Q=230}}}
{{{10D=230-10Q}}}
Substitute into eq. 2,
{{{230-10Q+25Q=455}}}
{{{15Q=225}}}
{{{Q=15}}}
Then from eq.1,
{{{D=23-15}}}
{{{D=8}}}