La respuesta es 81.
Eso es porque
81*1= 81,
27*3=81,
y 9*9=81.
The answer to this question is 600-28w > 300. This inequality can be described as $600 (money in the savings account) subtracted by $28w (withdrawal of $28 a week for food) should be greater than $300. It proves that the money will not drop below $300.