how many gallons of 12% salt solution should a biologist add to 5 gallons of 15% salt to get 14% salt solution

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?

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?