Aptitude/Reasoning & Quantitative Classes

10/05/2026

09/04/2026

Division by 5 tricks
🔹 Basic Idea
Dividing by 5 = Multiply by 2 and divide by 10
👉 Because:
🔹 Shortcut Trick
👉 Step 1: Multiply the number by 2
👉 Step 2: Move the decimal one place left (÷10)
🔹 Examples
1. 48 ÷ 5
48 × 2 = 96
Move decimal → 9.6
✅ Answer: 9.6
2. 236 ÷ 5
236 × 2 = 472
Move decimal → 47.2
✅ Answer: 47.2
3. 7 ÷ 5
7 × 2 = 14
Move decimal → 1.4
✅ Answer: 1.4
🔹 Super Fast Mental Trick
👉 Just double the number and put decimal before last digit
Example:
84 ÷ 5 → 168 → 16.8
19 ÷ 5 → 38 → 3.8

08/04/2026

https://youtu.be/--Fl6Vdxtsc?si=0DmAaihr5ezELVQs

A dishonest oats seller deceives the shopkeeper by 20% while buying. He also deceives the customer by 25% while selling. He claims to sell oats at a profit o...