Question 1 - Figure it out - Page 67, 68 - Chapter 3 Class 8 - Proportional Reasoning-2 (Ganita Prakash II)

Transcript

Question 1 Which of the following pairs of quantities are in inverse proportion? (i) The number of taps filling a water tank and the time taken to fill it.Now, As Number of Taps increases Taken taken to fill tank decreases So, they are in Inverse Proportion This is because tank has fixed capacity Question 1 Which of the following pairs of quantities are in inverse proportion? (ii) The number of painters hired and the days needed to paint a wall of fixed size.Now, As Number of Painters increases Taken taken to paint the wall decreases So, they are in Inverse Proportion This is because the wall is of fixed size Question 1 Which of the following pairs of quantities are in inverse proportion? (iii) The distance a car can travel and the amount of petrol in the tank.Now, As Amount of petrol in tank increases Distance car travels increases So, they are in Direct Proportion Note: Here, amount of petrol is Amount of petrol in the tank. Not how much amount is remaining Question 1 Which of the following pairs of quantities are in inverse proportion? (iv) The speed of a cyclist and the time taken to cover a fixed route.Now, As Speed of Cyclist increases Taken taken to cover route decreases So, they are in Inverse Proportion This is because the route is fixed Question 1 Which of the following pairs of quantities are in inverse proportion? (v) The length of cloth bought and the price paid at a fixed rate per metre.Now, As Length of cloth increases Price paid also increases So, they are in Direct Proportion Question 1 Which of the following pairs of quantities are in inverse proportion? (vi) The number of pages in a book and the time required to read it at a fixed reading speed.Now, As Number of pages in a book increases Time taken to read it also increases So, they are in Direct Proportion