Lecture Notes - Arithmetic & Problem Solving

Introduction

• Today's session: Discussion based on questions
• Objective: Revision of arithmetic and problem solving

Session Structure

• Solving questions one by one
• 2 minutes will be given for each question

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Question 1: Vendor and Sales

• Question: About the cost of clothing, profit, and selling price
• Correct Answer: 144
• Process:
  • Vendor's cost of selling article ₹100
  • Sell at premium price in the first 8 months
  • Sell at half the price in the next 4 months
• Result: 20% profit obtained

Question 2: Profit Percentage

• Profit = (Selling Price - Cost Price) / Cost Price
• 220% profit means: Profit = 2.2
• If the cost price is ₹5, then the selling price will be ₹16.

Question 3: Shopkeeper Discount

• Question: Shopkeeper gave a 16% discount and gained 25% profit.
• Priority: Calculate the profit percentage.

Question 4: Profit and Loss

• Question: If the total cost is ₹1200 and the shopkeeper obtained a 25% profit, find the selling price.

Question 5: Selling Price and Profit

• Calculation of selling price: At 125% of cost price.

Question 6: Time Speed Distance

• Question: Relation between a person's speed and distance.
• Time = Distance / Speed.

Question 7: Ratio and Practical Questions

• Studied changes in ratios.
• Solved problems using various ratios.

Question 8: Mixture Problems

• Solved questions using the principle of mixtures.

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Conclusion

• Summarized and analyzed all questions.
• Emphasized important points for revision.
• Plan to share notes on Telegram at the end of class.

Next Class

• Next class will focus on more difficult questions.
• Study material and solutions will be shared for the questions.