Lecture-6


00:00:36 NCERT Exercise 3.5 Question 4 part (iii) Yash scored 40 marks in a test, getting 3 marks for each right answer and losing 1 mark for each wrong answer. Had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then Yash would have scored 50 marks. How many questions were there in the test?

00:07:56 NCERT Exercise 3.5 Question 4 part (iv) Places A and B are 100 km apart on a highway. One car starts from A and another from B at the same time. If the cars travel in the same direction at different speeds, they meet in 5 hours. If they travel towards each other, they meet in 1 hour. What are the speeds of the two cars?

00:17:36 NCERT Exercise 3.5 Question 4 part (v) The area of a rectangle gets reduced by 9 square units, if its length is reduced by 5 units and breadth is increased by 3 units. If we increase the length by 3 units and the breadth by 2 units, the area increases by 67 square units. Find the dimensions of the rectangle.

00:28:56 NCERT Exercise 3.6 Question 1 part (i)

00:34:26 NCERT Exercise 3.6 Question 1 part (ii)