For how many weeks would the class need to sell cookies in order to earn $5000.

fyi: if in 3 weeks profit is $500.

The answer is 30 weeks.
To find this, first divide $500 and 3, giving you the answer of 166.666667. Round it up to the nearest hundredth, which would be 166.67. 
$166.67 per week.
Then divide 5000 and 166.67 which gives you 29.9994. Round up to  the nearest whole and your answer would be 30. It would take 30 weeks.

Sorry can't answer that question