DAY 271
A man went on a five-day fishing trip. He caught 3 fish more each day than he did the day before, for a total of 30 fish over the five days. How many fish did he catch the first day?

Answer:

He didn't catch any fish the first day. He caught 3 on the second day, 6 on the third day, 9 on the fourth day, and 12 on the fifth day. Let x = the number of fish he caught on the first day............ x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 30