Question 9 - Figure it out - Page 67, 68 - Chapter 3 Class 8 - Proportional Reasoning-2 (Ganita Prakash II)

Transcript

Question 9 A school has 8 periods a day, each of 45 minutes duration. How long is each period, if the school has 9 periods a day, assuming that the number of school hours per day stays the same?Given that, There are 8 periods per day, with 45 minutes duration each We need to find how much duration of each period will be if there are 9 periods per day Let Duration of each period be 𝒚 Now, we draw a table Now, as Total number of school hours is same As Number of periods increase Duration of each period will decrease So, they are in Inverse Proportion So, we write numbers as 𝒙_𝟏 𝒚_𝟏 = 𝒙_𝟐 𝒚_𝟐 8 × 45 = 9 × 𝑦 (8 × 45)/9=𝑦 8 × 5 = 𝑦 40 = 𝑦 𝒚 = 40 So, each period will be of 40 minutes