Question

13. A boy was p years old r years ago. How old is he now? How old will he be in (p – r) year's time?​

Answer 1

Answer:

A boy was ‘p’ year old ‘r’ years ago, so to find the current age we have to add r years to p.

So the required age of him will be (p + r) years.

Now we have to find his age after (p – r) years.

So, we have to add (p – r) to his present age.

So the required age will be = (p + r) + (p – r) = 2p.

Now, it is given that Hari was 5 years older than Anushka.

So let us assume age of Anushka is ‘x’ years so age of Hari will be (x + 5)

Now, it is given that Hari is twice older than her.

So age of Hari will be twice of Anushka i.e. 2x

Therefore, we can write,

2x = x + 5

i.e. x = 5.

Hence, the age of Anushka is 5 years and the age of Hari is 5 + 5 = 10 years.

Answer 2

Step-by-step explanation:

So the required age of him will be (p + r) years. Now we have to find his age after (p – r) years. So, we have to add (p – r) to his present age. So the required age will be = (p + r) + (p – r) = 2p.