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Last updated at June 21, 2018 by Teachoo

Transcript

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₯β5/2 & Multiplies results by 8 β΄ New number = 8 (π₯β5/2) Also, Given, New number = 3 Γ Old number 8 (π₯β5/2)=3π₯ 8π₯β8 Γ5/2=3π₯ 8π₯β4 Γ5=3π₯ 8π₯β20=3π₯ 8π₯=3π₯+ 20 8π₯β3π₯=20 5π₯=20 π₯=20/5 π₯ = 4 β΄ The number Amina thought = x = 4.

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.