Question 892873
{{{F=2D}}}
.
.
{{{0.5F+D=154}}}
{{{F+2D=308}}}
Substitute,
{{{2D+2D=308}}}
{{{4D=308}}}
{{{D=77}}}
Then,
{{{F=2(77)}}}
{{{F=154}}}
.
.
.
154 50 cent coins and 77 dollar coins.