Question 600351
Let earnings of Snow white = X
Average of the eight = {{{( 140+X )/8}}}

Snow White's earning is $3.50 more than the average of the eight, 
so
{{{X=(( 140+X )/8)+3.5}}}
OR
{{{X=( 140+X+28 )/8}}}
OR
8X = 168 + X
OR
8X - X = 168
OR
7X = 168
X = 168/7
X = 24

So Snow White earn $24