A question for you all. It is not a challenge. Q/. when I was 4 years old then my sister was half of me and when I will be of 80 then my sister's age will be ? you can give a short answer also.
Answers
Here the question states that when the brother was 6 years old , his sister was half of his age. This means her sister's age at that time would be
= 6÷2 = 3 years
Now we know that brother is 6 years old and his younger sister is 3 years old. According to the statement we get to know that the brother is 3 years elder than his sister ( 6 years — 3 years = 3 years ).
Further question states that the present age of the brother is 12 years. We have to calculate the present age of sister , from the above calculations we know that the brother is 3 years elder than her sister ( shown above ). This means that his sister is 3 years younger than him.
So the present age of the sister is
= 12 years — 3 years
= 9 years
Hence , the age of sister is 9 years.
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Answer:
Solution:
Method 1: Using passed years for both persons.
Relationship of my age and my sister’s age:
When I was 4 years:
My sisters’s age : My age/ 2 = 4/2=2 years
Our age difference : 4 - 2 = 2 years
At present:
When I am 100 years old:
I am 100 years old after passing 100–4= 96 years.
96 years passed for my sister also.
She was 2 years old when i was 4 years old. Therefore she is now 2 + 96= 98 years old.
Method 2: Using Age Difference.
Relationship of my age and my sister’s age:
When I was 4 years:
My sisters’s age : My age/ 2 = 4/2=2 years
Our age difference : 4 - 2 = 2 years
At present:
When I am 100 years old:
My sister is 2 years younger than me
My sister’s age = My present age - our age difference
My sister’s age = 100 - 2 = 98 years
My sister’s age = 98 years after passing 96 years.
Edit:
Method 3: Using Age Difference.
( In simple English language)
My age = 4 years.
My sister’s age = 1/2(my age) = 1/2 × 4 = 2 years
Difference of ages or birth dates: 4 - 2 = 2 years
It means my sister is 2 years younger than me. If at anytime, age of one of us is known, the age of other person can be calculated.
At present my age is 100 years, therefore my sister’s age is = 100 - 2 = 98 years
My sister’s age is = 98 years.
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Step-by-step explanation:
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