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  1. Chapter 2 Class 8 Linear Equations in One Variable
  2. Serial order wise
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Ex 2.4, 1 Amina thinks of a number and subtracts 5/(2 ) from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number? Let the number Amina thought be π‘₯ Given that, She Subtracts 5/2 from it, i.e. π‘₯βˆ’5/2 & Multiplies results by 8 ∴ New number = 8 (π‘₯βˆ’5/2) Also, Given, New number = 3 Γ— Old number 8 (π‘₯βˆ’5/2)=3π‘₯ 8π‘₯βˆ’8 Γ—5/2=3π‘₯ 8π‘₯βˆ’4 Γ—5=3π‘₯ 8π‘₯βˆ’20=3π‘₯ 8π‘₯=3π‘₯+ 20 8π‘₯βˆ’3π‘₯=20 5π‘₯=20 π‘₯=20/5 π‘₯ = 4 ∴ The number Amina thought = x = 4.

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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.