Ratios & Percentages

Chapter 7 Class 8 Comparing Quantities
Concept wise

### Transcript

Ex 7.1, 5 (Method 1) If Chameli had Rs 600 left after spending 75% of her money, how much did she have in the beginning?Given, Percentage of Money spent = 75% ∴ Percentage of Money left = 100% − Percentage of money spent = 100 − 75 = 25% Let Total Money = x Given that Money left = Rs 600 Therefore, Percentage of money left = (𝑀𝑜𝑛𝑒𝑦 𝐿𝑒𝑓𝑡)/(𝑇𝑜𝑡𝑎𝑙 𝑀𝑜𝑛𝑒𝑦) × 100 25 = 𝟔𝟎𝟎/𝒙×𝟏𝟎𝟎 x = 600/25 × 100 x = 600 × 100/25 x = 600 × 4 x = 2400 ∴ Total Money = x = Rs 2400 Ex 7.1, 5 (Method 2) If Chameli had Rs 600 left after spending 75% of her money, how much did she have in the beginning?Given, ∴ Percentage of Money spent = 75% ∴ Percentage of Money left = 100% − Percentage of money spent = 100 − 75 = 25% Now, Money left = Total Money × Percentage of Money left 600 = Total Money × 25% 600 = Total Money × 25/100 600 × 100/25 = Total Money Total Money = 600 × 𝟏𝟎𝟎/𝟐𝟓 Total Money = 600 × 4 Total Money = Rs 2400

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#### Davneet Singh

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.