HELP?! VERTEX OF THIS?

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?

Jacks bank statement shows an account balance of -$25.50. which describes the magnitude, of size, of the debt in dollars

How many bananas are in a fruit bowl that has 200 total apples and bananas if there are 31 bananas for every 93 apples