Question 5 - Figure it out - Page 73 - Chapter 4 Class 7 - Another Peek beyond the Point (Ganita Prakash II)

Transcript

Thus, Total amount spent = Cost of 4 notebooks + Cost of 3 erasers = 62 + 8.25 = 62 + 825/100 = (62 × 100 + 825)/100 = (𝟔𝟐𝟎𝟎 + 𝟖𝟐𝟓)/𝟏𝟎𝟎 = 7025/100 = ₹ 70.25 Since we need to write the answer in cm We convert all units to cm before Since 10 mm = 1 cm 1 mm = 1/10 cm Given Thickness of 1 coin = 1.45mm = 1.45 × 1/10 = 0.145 cm Now, we need to find Total height of the cylinder formed by placing 36 rupee coins one over the other Thus, Total height = 36 × Thickness of 1 coin = 36 × 0.145 = 36 × 145/1000 = 36 × 145 × 𝟏/𝟏𝟎𝟎𝟎 = 5220 × 1/1000 = 522 × 1/100 = 5.22 cm Thus, The total height is 5.22 cm