Question

Which of the following vary inversely as each other?

1. The number of pencil X you can buy with 12 rupees and the cost Y of pencil (which you can assume to be a multiple of 25 paise in this case).

2.
The number x of persons hired to construct a wall and the time why taken to finish the job.

3.t
The length x of a journey by bus and the price value of the ticket.​

Answer 1

Answer:

2.

Step-by-step explanation:

let me explain concept,

think you went to shop,you are buying chocolates

you have only 10₹, for each chocolate cost is 2₹.

you think to buy one chocolate for your self the. you pay 2₹ and you will go

after few minutes you remember that you want to buy one more chocolate for your brother

then you wil buy one more.

now observe as many chocolates you buy that many cost it increases

2₹ - one chocolate

4₹- two chocolate

6₹- three chocolate etc

.now you can observe that it is directly proportional hence this type is called direct proportion means they are directly proportional to each other.

think you want to fill a small tank in your home.

you will take 1 bucket and you will try to fill .

now you will take 2 bucket at a time and you will try to fill.now you can see that as no.of bucket increases tank fills early,this type you say as inverse proportion means they are inverse to each other.

now apply same concept

(1). as pencil increases its costs also increases.

it is directly related.

(2). as no.of person increases the wall completion gets completed early.

it is inversely related ( which means if one decreases another increases or vice versa)

(3). as you know if travel more distance ticket price also increases.

it is directly related.

hence, answer is only (2) will vary inversely.

any queries?

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