Question 1102933
{{{(500*1.70+x*0.80)/(x+500)=1.55}}}

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{{{0.8x+500*1.7=1.55(x+500)}}}

{{{0.8x+500*1.7=1.55x+1.55*500}}}

{{{(1.55-0.8)x=(1.7-1.55)*500}}}

{{{0.75x=0.15*500}}}

{{{x=(0.15*500)/0.75}}}

{{{highlight(x=100)}}}