# NCERT Class 12-Mathematics: Chapter – 12 Linear Programming Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 22**:

A manufacturer produces two Models of bikes - Model X and Model Y. Model X takes a 6 man-hours to make per unit, while Model Y takes 10 man-hours per unit. There is a total of 450 man-hour available per week. Handling and Marketing costs are ₹ 2000 and ₹ 1000 per unit for Models X and Y respectively. The total funds available for these purposes are ₹ 80,000 per week. Profits per unit for Models X and Y are ₹ 1000 and ₹ 500, respectively.

How many bikes of each model should the manufacturer produce so as to yield a maximum profit? Find the maximum profit.

**Answer**:

**Question 23**:

In order to supplement daily diet, a person wishes to take some X and some wishes Y tablets. The contents of iron, calcium and vitamins in X and Y (in milligrams per tablet) are given as below:

Tablets | Iron | Calcium | Vitamin |

X | |||

Y |

The person needs at least 18 milligrams of iron, 21 milligrams of calcium and 16 milligram of vitamins. The price of each tablet of X and Y is ₹ 2 and Re 1 respectively. How many tablets of each should the person take in order to satisfy the above requirement at the minimum cost?

**Answer**:

**Question 24**:

A company makes 3 model of calculators: A, B and C at factory I and factory II. The company has orders for at least 6400 calculators of model A, 4000 calculator of model B and 4800 calculator of model C. At factory I, 50 calculators of model A, 50 of model B and 30 of model C are made every day; at factory II, 40 calculators of model A, 20 of model B and 40 of model C are made every day. It costs ₹ 12000 and ₹ 15000 each day to operate factory I and II, respectively. Find the number of days each factory should operate to minimise the operating costs and still meet the demand.

**Answer**:

**Question 25**:

Maximise and Minimise subject to

**Answer**:

## Objective Type Questions

### Choose the Correct Answer from the Given Four Options in Each of the Exercises 26 to 34

**Question 26**:

The corner points of the feasible region determined by the system of linear constraints are (0,0) , (0,40) , (20,40) , (60,20) , (60,0) . The objective function is Z = 4*x* + 3*y*.

Compare the quantity in Column A and Column B

Column A | Column B |

Maximum of Z | 325 |

(A) The quantity in column A is greater

(B) The quantity in column B is greater

(C) The two quantities are equal

(D) The relationship can-not be determined on the basis of the information supplied

**Answer: B**

**Question 27**:

The feasible solution for a LPP is shown in Fig. 12.12. Let be the objective function. Minimum of Z occurs at

(A)

(B)

(C)

(D)

**Answer: B**

**Question 28**:

Refer to Exercise 27. Maximum of Z occurs at

(A)

(B)

(C)

(D)

**Answer: A**