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
∴ 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%
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

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.

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