A worker earns $24 on the first day and spends $18 on the second day. The worker earns $24 on the third day and spends $18 on the fourth day. If this pattern continues, on which day will the worker first reach a net total of $72?
Answers.
A) 9 B) 12 C) 17 D) 21 E) 24
Every two days, the net total is $6.   After 16 days, the worker will have $48.   On day 17, the worker will receive $24 for a net total of $72.   The answer is 17.
<result>C</result>
A worker earns $24 on the first day and spends $18 on the second day. The worker earns $24 on the third day and spends $18 on the fourth day. If this pattern continues, on which day will the worker first reach a net total of $72?