Need only handwritten solution only (not typed one). What is the cut-off grade of a gold mine deposit, in terms of gram of gold (Au) in a tonne ofore rock, when mining and processing cost of the ore rock is $17/t, pure gold (Au) price is$45/gr Au, and gold recovery from the mineral processing plant is 90%?Select one:OA. 0.39 gr Au/tOB. 0.40 gr Au/tOC. 0.41 gr Au/tOD. 0.42 gr Au/tOE.0.43 gr Au/t

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Answered: What is the cut-off grade of a gold…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Due to the inflation three stores had to close in a mall: one athletic shoe store, one kid's clothing store, and one department store. The mall received 30 applications from store owners who applied to the mall to have their kid's clothing store to replace the closed kid's store. The mall also received 60 applications from athletic shoe store and department store owners who applied their store to replace the closed department and athletic shoe store. If X = the number of applications for a store, use this information to complete the table X 30 40 60 P(x) xP(x) O P(x)=.30, .30, .30; xP(x)=9,12, 18 O P(x)=.33, .33, .33; xP(x)=9.90, 13.20, 19.80 O P(x)=.03, .03, .03; xP(x)=.90,1.2,1.8
The average salary of the entire staff in an office is ₹3200 per month. The average salary of the Officers is ₹6800 and that of the Non-officers is ₹2000. If thenumber of Officers is 5,then find the number of Non officers in the office.
Jerri has 210 stamps in her collection. She wants to arrange her stamps in a rectangular array so there are the same number of stamps in each row without any left over. What are all the different ways she can arrange her stamps, not worrying about order?
A tank can be filled by 2 water keys together in 3 hours with 3 quarters. The main key would be able to fill it by itself in 4 hours less than the other one. In how many hours can each key fill the tank separately?
Travis's carpet has an area of 180 square feet. He hires the CarpetPro carpet cleaning service, which is able to clean 9 square feet of his carpet every minute. Therefore, in the first minute, CarpetPro is able to clean 9 square feet of Travis's carpet (leaving 171 square feet remaining to be cleaned). In the second minute, the cleaner is again able to clean 9 square feet of carpet (leaving 162 square feet to be cleaned), etc. Which of the following functions expresses the number of square feet that still remain to be cleaned after t minutes from the time that the carpet cleaner began cleaning this carpet. A(t)=180−0.9t A(t)=180(0.1)t A(t)=180(0.9t) A(t)=180−9t A(t)=180−0.1t
A freight elevator can safely hold no more than 2000 pounds. An elevator operator must take 55-pound boxes to a storage area. If he weighs 165 pounds, how many boxes can he safely move at one time?

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