Question 1152977
{{{(0.75(180) + x)/(180 + x) = 0.80}}}
<pr>
{{{(135 + x)/(180 + x) = 0.80}}}
<pr>
{{{0.80(180 + x) = 135 + x}}}
<pr>
{{{144 + 0.80x = 135 + x}}}
<pr>
{{{9 = 0.20x}}}
<pr>
{{{x = 45}}}