Help plz..And No links

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?

Qrst is a parallelogram. determine the measure of ∠q pls

Ineed here’s a picture of the question