Question 1093376
f=$50 tickets
o=$150 tickets
t=$250 tickets
o=2t
f=4(t+o)
50f+150o+250t=69000
5f+15o+25t=6900
now let's substitute
20(t+o)+15o+25t=6900
20t+20o+15o+25t=6900
35o+45t=6900
35*2t+45t=6900
115t=6900
t=6900/115
t=60
o=120
f=4(180)=720
check
50*720+150*120+60*250=69000
69000=69000
ok