Which equation will solve the following word problem? bob spends an average of $66.42 per week at the grocery store. he spent $62.84 last week, and $71.02 this week. how much did bob spend two weeks ago?

($66.42 +$62.84 + $71.02)/3 = s

s + $62.84 + $71.02/2 = $66.42

$66.42 +$62.84 + $71.02/3 = s

(s + $62.84 + $71.02)/3 = $66.42