MBA Exam

If x, y, and z are positive real numbers, for what ratio of the values of y and z is the value of ( x/y + z/12x + 4y/x + x/3z) the minimum? If sumone cud post the approach

1) 1 : 4
2) 1 : 2
3) 1 : 1
4) 2 : 1
5) 4 : 1

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MBA Other Question

Two different solutions of honey, milk and water are mixed with each other three times in varying proportions. The concentration of honey and milk in the three resulting solutions are found to be (10%, 16%), (12%, 12%) and (16%, x%) respectively. What is the value of x?

1) 4
2) 7
3) 8
4) 10
What is the co-efficient of x^18 in (x+x^2+x^3+.....+x^6)^4 ?

1) 60
2) 70
3) 80
4) 90
5) 100