Question 847336
b for base length, x for either of the two equal sides.
{{{b=(1/3)x}}}
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{{{b+2x=105}}}, the perimeter information.
Substitute for b, {{{(1/3)x+2x=105}}}
{{{x+6x=315}}}
{{{7x=315}}}
{{{x=45}}} --------- {{{b=(1/3)45=15}}}