In what ratio must a person mix three kinds of wheat costing him 1.20,1.44 and 1.74 dollars per kg., so that the mixture formed is worth 1.41 dollars per kg? a)11:77:7 b)12:7:7 c)ratio other than a and b d)no solution
Is alligation valid here?
You should be able to answer c without doing any computation at all. As $1.41$ is between the upper and lower cost elements there is some mix that will produce it, so d is out. If you had only two things you could mix you could find a unique mix that would produce that cost. Given that you have three, there is a one dimensional set of solutions, so there will be some other than a and b. If you trust the problem setter to have made a unique solution, neither a nor b should yield the correct cost. You could check if you want.