1.Which of the following are in inverse proportion?
(i) The number of workers on a job and the time to complete the job.
(ii) The time taken for a journey and the distance travelled at a uniform speed.
(iii) Area of cultivated land and the crop harvested.
(iv) The time taken for a fixed journey and the speed of the vehicle.
(v) The population of a country and the area of land per person.
(i) The number of workers on a job and the time to complete the job.
(ii) The time taken for a journey and the distance travelled at a uniform speed.
(iii) Area of cultivated land and the crop harvested.
(iv) The time taken for a fixed journey and the speed of the vehicle.
(v) The population of a country and the area of land per person.
Answer :
(i) Here in this case we know that more is the number of workers to do a job, less is the time taken to finish the job.So, it is a case of inverse proportion.
(ii) Here,Clearly if more is the time taken, more is the distance travelled in a uniform speed.So, it is a case of direct proportion.
(iii) Here in this case, clearly more is the area cultivated land, more is the crop harvested. So, it is a case of direct proportion.
(iv) Here we know that more is the speed of the vehicle, less is the time to cover a fixed distance.So, it is a case of inverse proportion.
(v) Clearly here we can see that, more is the population, less is the area of land per person in a country.So, it is a case of inverse proportion.