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RD Sharma - Mathematics

10. Direct and Inverse Variable

1. Rational Numbers
2. Powers
3. Squares and Square Roots
4. Cubes and Cube Roots
5. Playing with Numbers
6. Algebraic Expressions and Identities
7. Factorization
8. Division of Algebraic Expressions
9. Linear Equation in One Variable
10. Direct and Inverse Variable
11. Time and Work
12. Percentage
13. Profit, Loss, Discount and Value Added Tax (VAT)
Compound Interest
15. Understanding Shapes-I (Polygons)
16. Understanding Shapes-II (Quadrilaterals)
17. Understanding Shapes-III (Special Types of Quadrilaterales)
18. Practical Geometry (Constructions)
19. Visualising Shapes
20. Mensuration-I (Area of a Trapezium and a Polygon)
21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)
22. Mensuration-III (Surface Area and Volume of a Right Circular Cylinder
23. Data Handling-I (Classification Representation of Data as Histograms)
24. Data Handling-II (Graphical Representation of Data as Pie Charts
25. Data Handling-III (Pictorial Representation of Data as Pie Charts
26. Data Handling-IV (Probability)
27. Introduction to Graphs

Exercise 10.1

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Exercise 10.2

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Q. 12

68 boxes of certain commodity require a shelf-length of 13.6 m. How many boxes of the same commodity would occupy a shelf length of 20.4m?

Class 8th RD Sharma - Mathematics 10. Direct and Inverse Variable

Answer :

Let the number of boxes be

On cross multiplication, we get

Therefore number of boxes is 102

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PREVIOUSA car is travelling at the average speed of 50 km/hr. How much distance would it travel in 12 minutes?NEXTIn a library 136 copies of a certain book require a shelf-length of 3.4 metre. How many copies of the same book would occupy a shelf length of 5.1 metres?

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