Find the measure of angle A.

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

For each proportion find the unknown number x 1/5/8=×/15

Need on this geometry question. explain how you did it.