# Direct and Inverse Variation Class-8th RS Aggarwal ICSE Maths Goyal Brothers

Direct and** Inverse Variation Class-8th RS** Aggarwal ICSE Mathematics Goyal Brothers Prakashan Chapter-9. We provide step by step Solutions of Exercise / lesson-10 Direct and** Inverse Variation** for ICSE **Class-8 RS** Aggarwal Mathematics.

Our Solutions contain all type Questions of Exe-10 A, Exe-10 B, (MCQ) and Mental Maths with Notes to develop skill and confidence. Visit official Website **CISCE** for detail information about ICSE Board Class-8 Mathematics.

### Direct and** Inverse Variation Class-8th RS** Aggarwal ICSE Mathematics Goyal Brothers Prakashan Chapter-9

**-: Select Topic :-**

Direct Proportion Definitions

The proportion is said to be a **direct proportion** between two values when one is a multiple of the other.

**Directly Proportion Symbol**

The symbol used to represent the direct proportion is “**∝**”.

### Inverse Proportion

The value is said to inversely proportional when one value increases and the other decreases. The proportionality symbol is used in a different way.

**Inverse Proportion Definition**

Two quantities a and b are said to be in inverse proportion if an increase in the quantity a, there will be a decrease in the quantity b, and vice-versa

### How to Set up an Equation?

- First, write down the proportional symbol
- Convert it as an equation using the constant of proportionality
- Find the constant of proportionality from the given information
- After finding the constant of proportionality, substitute in an equation.

**Exercise – 10 A,** Direct and** Inverse Variation Class-8th RS** Aggarwal ICSE Mathematics Goyal Brothers Prakashan

**Question 1 :**

If the cost of 40 toy is 1024. what is the cost of one dozen such toys?

**Question 2:**

If 18 notebook …………………… 425.50 ?

**Question 3:**

………………….

………………….

………………….

…………………..

**Question 15:**

7 worker working 6 hours a day can build a wall in 12 days. Hoe many days will 3 worker take to build a similar wall, working 8 hour a day.

### Direct and** Inverse Variation Exercise – 10 B MCQ of Class-8th RS** Aggarwal Mathematics Goyal Brothers Prakashan

**choose the correct option in each of the following :**

**Question 1:**

If 20 article cost 90. the cost of 9 article is.

…………………

**Question 2:**

With 1000 Rs. one can buy 4 pair …………………… and 3 shirts ?

**Question 3:**

…………………

…………………

………………..

**Question 11:**

if 4/5 th part of ………………… rest of it.

### Mental Maths, Chapter-10 of ICSE Class-8 Mathematics Goyal Brothers Prakashan

fill in the blanks………….

**Question 1:**

(i) when x and y are in direct proportion then

(ii) If x men can do ………………. days.

(iii) If m article cost ……….

(iv) If 8 oranges cost ………….

(v) 6 pipe can fill…………..

**Question 2:**

Write true or false :

–: End of **Direct and Inverse Variation Class-8th RS** Aggarwal Solutions :–

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