Students sold rafle tickets to raise money for a field trip. the first 20 tickets sold costs $4 each. to sell more tickets, they lowered the price to $2 each. if they raise $216, how many tickets did they sell in all.

X=20
4x+2y=216
80+2y=216
2y=144
y=72
They sold 92 tickets in all

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)