3. Suppose you have a 300 gallon tank filled to the top with brine that begins with 50 lbs of salt in it. If you begin draining the well-mixed brine from the bottom of the tank at a rate of 15 gallons per minute while. If you want the tank to have 10 lbs of salt in it when it gets down to 100 gallons, at what rate should you be pouring in brine with a 1 lb of salt per 10 gallons consistency?

While the rate at which ethanol can be produced is important, the total quantity of ethanol that can be produced from a given crop is also important. Use the information listed below to calculate the theoretical yield of ethanol from a 1 hectare plot of corn and a 1 hectare plot of sugarcane in the U.S. (1 hectare = 2 football fields). Show your calculations. Corn Yield: 138 bushels of seed per hectare 1 bushel seed = 2.8 gallons ethanol Sugarcane Yield: 89 tons sugarcane per hectare 1 ton sugarcane = 19.5 gallons ethanol

(14) The coffee shop sells a coffee blend made from two coffees, one costing 5 €/ kg and the other costing 6€/kg. If the blended coffee sells for 5.60€ /kg, find how much of each coffee is used to obtain the desired blend. Assume that the weight of the blended coffee is 100 kg.

1. Suppose that a commercial truck has an efficiency of 120 – 2v m(v) miles/gallon going at speed of v miles/hour. The driver's rate is 15 dollars/hr, and gas is $3.50/gal- lon. a. Find the cost C(v) per mile to travel at speed v mph. b. Find the cheapest driving speed.