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

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 (↑)

## 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 TricksIn 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. |

Numbers
Highest Common Factor And Least Common Multiple
Decimal
Fractions
Simplification
Surds And Indices
Chain Rule
Square Root And Cube Root
Ratio And Proportion
Pipes And Cisterns
Boats and Streams
Problems on Trains
Alligation or Mixtures
Time and Distance
Geometry
Time and Work
Simple Interest
Problem Solving

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- NTS GAT Introduction
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- How to Identify the Subject of a Sentence
- How to Study for the NTS GAT
- How to Solve a Rational Equation
- State Bank Officers Training Scheme (SBOTS)
- Sentence Completion
- How to Study for the NTS GAT
- How to Build and Reduce Fractions
- Interview questions for Human Resource Manager