Question 279796
What we know:
p=2l+2w
p=70
l=3w
What we need to find:
w=
l=
Use substitution to find w
p=2l+2w
{{{70=2(3w)+2w}}}
{{{70=6w+2w}}}
{{{70=8w}}}
{{{highlight(35/4=w)}}}
{{{l=3w}}}
{{{l=3(35/4)}}}
{{{highlight(l=105/4)}}}
Check
{{{70=2(105/4)+2(35/4)}}}
{{{70=(105/2)+(35/2)}}}
{{{70=(140/2)}}}
{{{70=70}}}
Correct