Zero pint eight x minus eight equals two x plus four

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

How many ordered pairs of positive integers satisfy xy=32?

Five infinity stones cost $16.80. what is the price per infinity stone ?