SOLUTION: 1. Sixty ounces of a 40% gold alloy are mixed with 40 oz of a 10% gold alloy. Find the percent concentration of the resulting gold alloy. 2. How many pounds of chicken feed that

Question 805206: 1. Sixty ounces of a 40% gold alloy are mixed with 40 oz of a 10% gold alloy. Find the percent concentration of the resulting gold alloy.
2. How many pounds of chicken feed that is 50% corn must be mixed with 430 lb of a feed that is 80% corn to make a chicken feed that is 75% corn?
3. A chemist wants to make 54 mL of a 16% acid solution by mixing a 12% acid solution and an 18% acid solution. How many milliliters of each solution should the chemist use?
12% solution?
18% solution?
4.Two planes start from the same point and fly in opposite directions. The first plane is flying 45 mph slower than the second plane. In 2 h, the planes are 570 mi apart. Find the rate of each plane.
slower plane mph
faster plane mph
5.A long-distance runner started on a course at an average speed of 8 mph. Half an hour later, a second runner began the same course at an average speed of 9 mph. How long after the second runner starts will the second runner overtake the first runner?
6.An executive drove from home at an average speed of 45 mph to an airport where a helicopter was waiting. The executive boarded the helicopter and flew to the corporate offices at an average speed of 60 mph. The entire distance was 170 mi. The entire trip took 3 h. Find the distance from the airport to the corporate offices.

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
1)
100x=60*.4+40*.1
100x=24+4
100x=28
x=.28=28%

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