The prices of tickets for the local rock concert were $16 for friday night and $28 for saturday night. the total attendance for the two nights was 1090. if the total receipts were $24,232, how many people attended saturday night?

For thsi you need to think of 2 simulatneous equations=
16f + 28s= 24232
f + s = 1090
We need to find a way to subtract one equation from the other so you can multiply the bottom by 16
so you would get
16f + 28s = 24232
16f + 16s = 17440
Now you can subtract the second one from the bottom one to get
12s= 6792
s= 566
So there were 566 tickets sold on staurday so to find fridasy you can do 1090 -566, which is 524
so on friday night 524 were sold and on saturday there was 566 sold

You need to divide 200 by 6 and then times that by 70% i think