Check sibling questions

Ex 2.4, 1 - Amina thinks of a number and subtracts 5/2 from it

Ex 2.4, 1 - Chapter 2 Class 8 Linear Equations in One Variable - Part 2

This video is only available for Teachoo black users

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Question 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 𝑥 Given that, She Subtracts 5/2 from it, i.e. 𝑥−5/2 & Multiplies results by 8 ∴ New number = 8 (𝑥−5/2) Also, Given, New number = 3 × Old number 8 (𝑥−5/2)=3𝑥 8𝑥−8 ×5/2=3𝑥 8𝑥−4 ×5=3𝑥 8𝑥−20=3𝑥 8𝑥=3𝑥+ 20 8𝑥−3𝑥=20 5𝑥=20 𝑥=20/5 𝑥 = 4 ∴ The number Amina thought = x = 4.

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.