Question 345405
{{{a+b+c=P}}}
Substitute,
{{{10+(1/3)P+(1/6)P=P}}}
{{{10+(2/6)P+(1/6)P=P}}}
{{{10+(3/6)P=P}}}
{{{10+(1/2)P=P}}}
{{{10=(1/2)P}}}
{{{P=20}}} inches