I'm super confused and can't figure out the answer, ?

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?

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume