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  1. Chapter 2 Class 8 Linear Equations in One Variable
  2. Serial order wise
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Ex 2.2, 9 The ages of Rahul and Haroon are in the ratio 5:7. Four years later the sum of their ages will be 56 years. What are their present ages?Given that Ages of Rahul and Haroon are in the ratio 5:7 (𝐴𝑔𝑒 π‘œπ‘“ π‘…π‘Žβ„Žπ‘’π‘™)/(𝐴𝑔𝑒 π‘œπ‘“ π»π‘Žπ‘Ÿπ‘œπ‘œπ‘›)=5/7 Let age of Rahul = 5x years & age of Haroon = 7x years After 4 years, Age of Rahul = (5x + 4) Years Age of Haroon = (7x + 4) Years Given that 4 years later, Sum of Rahul’s age & Haroon’s age = 56 (5x + 4) + (7x + 4) = 56 5x + 7x + 4 + 4 = 56 12x + 8 = 56 12x = 56 βˆ’ 8 12x = 48 x = 48/12 x = 4 ∴ Present age of Rahul = 5x = 5 Γ— 4 = 20 Years & Present age of Haroon = 7x = 7 Γ— 4 = 28 Years

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.