A theater sells tickets for a concert. Tickets for lower-level seats sell for $35 each, and tickets for upper-level seats sell for $25 each. The theater sells 350 tickets for $10,250. How many tickets of each type were sold?\",[{""content"":""a*25+b*35=10250<br \/>a\u00a0 \u00a0 \u00a0 +b\u00a0 \u00a0 \u00a0= 350\u00a0 \u00a0 \u00a0 \u00a0 \u00a0| * -25<br \/><br \/>25a\u00a0 \u00a0 + 35b= 10. 250<br \/>-25a\u00a0 \u00a0 -25 b=\u00a0 -8.750<br \/>------------------------------<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 10b = 1500<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 b=1500:10<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<strong>b=150\u00a0 tickets cost 35 $<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/strong>a= 350-150<strong><br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 a= 200 tickets cost 25 $<\/strong>""}