Maximize: z = 3x₁ + 4x₂ subject to 2x₁ + x₂ ≤ 40, 2x₁+ 5x₂ ≤ 180, x₁, x₂ ≥ 0. In the LPP, which one of the following is feasible corner point?

(a)

x₁ = 18, x₂ = 24

(b)

x₁ = 15, x₂ = 30

(c)

x₁ = 2.5, x₂ = 35

(d)

x₁ = 20.5, x₂ = 19

In constructing the network which one of the following statement is false?

(a)

Each activity is represented by one and only one arrow. (i.e) only one activity can connect any two nodes

(b)

Two activities can be identified by the same head and tail events

(c)

Nodes are numbered to identify an activity uniquely. Tail node (starting point) should be lower than the head node (end point) of an activity

(d)

Arrows should not cross each other

A solution which maximizes or minimizes the given LPP is called ______.

(a)

a solution

(b)

a feasible solution

(c)

an optimal solution

(d)

none of these

The maximum value of the objective function Z = 3x + 5y subject to the constraints x > 0 , y > 0 and 2x + 5y ≤ 10 is ______.

(a)

6

(b)

15

(c)

25

(d)

31

Which of the following is not correct?

(a)

Objective that we aim to maximize or minimize

(b)

Constraints that we need to specify

(c)

Decision variables that we need to determine

(d)

Decision variables are to be unrestricted