Question 187797
Ok, you're headed in the right direction:
{{{80<=(68+82+87+89+x)/5)<90}}} First, multiply all three elements by 5.
{{{400<=(68+82+87+89+x)<450}}} Now add the integers in the middle.
{{{400<=326+x<450}}} Now subtract 326 from all three elements.
{{{highlight(74<=x<124)}}}