Chain Rule

Video Lesson on Chain Rule

Chain rule is commonly applied in Ratios and proportions questions when more than two ratios are inter-related.

Points to Remember

1) Direct Proportion:

Any two quantities are said to be directly proportional, if on the increase of one quantity, the other quantity increases and vice-versa.

Example: Cost is directly proportional to number of objects
Cost ? Number of objects
Number of objects increases (↑) Cost (↑)
Example: Work done is directly proportional to number of working men
Work done ? Number of working men
Number of men increase (↑) Work done (↑)

Full Section (3 MCQ)

Chain Rule 30 MCQ

1700 Question Quizzes with Answers

2) Indirect Proportion:

Any two quantities are said to be indirectly proportional, if on the increase of one quantity, the other quantity decreases and vice-versa.

Example: If speed of car is increases, then the time required to cover the distance decreases.
Speed of car (↑) Time required decreases (↓)
Example: Time taken to finish work increases, if number of men decrease.
Time (↑) Number of men (↓)

Tips and Tricks

In this chapter generally different types of numerical related to time and work, time and speed, cost and number of articles, men and work, etc. are asked.