Question 1154980

 A mechanic has a {{{55}}}-gallon drum filled with a solution that she uses to clean tools. 
She estimates that she {{{uses}}} two gallons of this solution {{{each}}}{{{ week}}}=> so, {{{2}}} gallons will be subtracted each week from total of  {{{55}}}, and if the number of weeks is {{{w}}} you deduct {{{2w}}} 
 


=> answer is: {{{S(w) = 55 - 2w}}}