A test consists of ‘True’ or ‘False’ questions. Case Based class 10

LINEAR EQUATIONS INTWO VARIABLES
CASE STUDY-1:
A test consists of ‘True’ or ‘False’ questions. One mark is awarded for every correct answer while ¼ mark is deducted for every wrong answer. A student knew answers to some of the questions. Rest of the questions he attempted by guessing. He answered 120 questions and got 90 marks
1. If answer to all questions he attempted by guessing were wrong, then how many questions did he answer correctly?
2. How many questions did he guess?
3. If answer to all questions he attempted by guessing were wrong and answered 80 correctly, then how many marks he got?
4. If answer to all questions he attempted by guessing were wrong, then how many questions answered correctly to score 95 marks?
CASE STUDY-2:
Amit is planning to buy a house and the layout is given below. The design and the measurement has been made such that areas of two bedrooms and kitchen together is 95 sq.m.
Based on the above information, answer the following questions:
1. Form the pair of linear equations in two variables from this situation.
2. Find the length of the outer boundary of the layout.
3. Find the area of each bedroom and kitchen in the layout.
4. Find the area of living room in the layout.
5. Find the cost of laying tiles in kitchen at the rate of Rs. 50 per sq.m
Case study-3 :
It is common that Governments revise travel fares from time to time based on various factors such as inflation ( a general increase in prices and fall in the purchasing value of money) on different types of vehicles like auto, Rickshaws, taxis, Radio cab etc. The auto charges in a city comprise of a fixed charge together with the charge for the distance covered. Study the following situations
Name of the city
Distance travelled (Km)
Amount paid (Rs.)
City A
10
75
15
110
City B
8
91
14
145
Situation 1: In city A, for a journey of 10 km, the charge paid is Rs 75 and for a journey of 15 km, the charge paid is Rs 110.
Situation 2: In a city B, for a journey of 8km, the charge paid is Rs91 and for a journey of 14km, the charge paid is Rs 145.
Refer situation 1
1. If the fixed charges of auto rickshaw be Rs x and the running charges be Rs y km/hr, the pair of linear equations representing the situation is
a) x + 10y =110, x + 15y = 75
b) x + 10y =75, x + 15y = 110
c) 10x + y =110, 15x + y = 75
d) 10x + y = 75, 15 x + y =110
2. A person travels a distance of 50km. The amount he has to pay is
a) Rs.155
b) Rs.255
c) Rs.355
d) Rs.455
Refer situation 2
3. What will a person have to pay for travelling a distance of 30km?
a) Rs.185
b) Rs.289
c) Rs.275
d) Rs.305
4. The graph of lines representing the conditions are: (situation 2)

A test consists of ‘True’ or ‘False’ questions.class 10case based