Which of the following quantities are in inverse proportion? State the assumption made in each case. a The number of pencils Serzhan buys and the total cost of the pencils. b. The number of man laying a road and the time taken to finish laying the road.
c. The number of taps filling a tank and the time taken to fill the tank
d. The number of cattle to be fed and the time taken to finish a certain amount of the fodder.