What is the answer to this?

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?

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

Which of these triangle pairs can be mapped to each other using two reflections?