Example 3 - If the weight of 12 sheets of thick paper is 40 grams, how

Example 3 - Chapter 13 Class 8 Direct and Inverse Proportions - Part 2
Example 3 - Chapter 13 Class 8 Direct and Inverse Proportions - Part 3


Transcript

Example 3 If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2 1/2 kilograms? First, we convert into grams 21/2 kg = (2 × 2 + 1)/2 kg = 5/2 kg = 5/2 × 1000 g = 5 × 500 g = 2500 g Now, Given that, Weight of 12 sheets of thick paper is 40 grams We need to find number of sheets if weight is 2500 g Let number of sheets be x Thus, our table looks like Now, as number of sheets increases, weight increases ∴ They are in direct proportion 12/40 = 𝑥/2500 12/40 × 2500 = 𝑥 3/10 × 2500 = 𝑥 3 × 250 = 𝑥 750 = 𝑥 𝑥 = 750 ∴ 750 sheets will weight 2 1/2 kilograms

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.