Solution: Page 259-261 (Real World)

Page 259: Banking

1. Credits and Debits

• Start: 0
• Credits (+): 30, 40, 50 $\rightarrow$ Total +120
• Debits (-): 40, 50, 60 $\rightarrow$ Total -150
• Balance: $120 - 150 = -30$.
• Answer: Rs -30.

2. Powers of 2 Debits

• Debits: 1, 2, 4, 8, 16, 32, 64, 128.
  • Sum of these debits: $1+2+4+8+16+32+64+128 = 255$.
  • Total Debit: -255.
• Credit: +256.
• Balance: $-255 + 256 = +1$.
• Answer: Rs 1.

Page 261: Geographical Cross Section

1. Heights

• A: Highest peak. Approx +1500m.
• B: A dip below sea level. Approx -500m.
• C: Lower peak. Approx +500m.
• D: Deepest point. Approx -1200m.
• E: High peak. Approx +1000m.
• F: Shallow water. Approx -200m.
• G: Near sea level. Approx +100m.

2. Highest and Lowest

• Highest: A (+1500)
• Lowest: D (-1200)

3. Ordering

• Decreasing (High to Low): A, E, C, G, F, B, D.
• Increasing (Low to High): D, B, F, G, C, E, A.

4. Earth Facts

• Highest: Mt Everest (approx 8848m).
• Lowest: Mariana Trench (approx -11000m).