NCERT Solutions for Class 8 Mathematics Chapter 13
Important NCERT Questions
Direct and Inverse Proportions Chapter 8 Exercise 13.1
NCERT Books for Session 2022-2023
CBSE Board
Questions No: 5
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram. What is the actual length of the bacteria? If the photograph is enlarged 20,000 times only, what would be its enlarged length?
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Let enlarged length of bacteria be x .
Actual length of bacteria = 5/5000 = 1/10000 cm=10⁻⁴
Length 5 x
Enlarged length 50,000 20,000
Here length and enlarged length of bacteria are in direct proportion.
∴ 5/50000 = x/20000 ⇒ xX50000 = 5×20000 ⇒ x= 5×20000/50000 = 2cm
Hence, the enlarged length of bacteria is 2 cm.
Class 8 Maths Chapter 11 Exercise 13.1 Solution in Video
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https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-13/