Ye has his own business. He checks his sales receipts three times a day. One day, his afternoon sales eere $50 more than his morning sales, and his evening sales were three times his afternoon sales. If his total slaes for the day were $1,000, what were his evening sales?

Let his morning sakes be $m, then afternoon sales were m+50, and his evening sales were 3m+150.
Total sales=m+m+50+3m+150=1000.
5m=1000-200=800, so m=800/5=$160. His evening sales were 3(160+50)=3×210=$630.