Natasha1 said:Homework Statement
Today i am half as old as my brother was 7 years ago. I am 11 years younger than my brother. How old am i?
2. The attempt at a solution
Let I = Me and B = Brother
Let: Brother age = x
Hence my age now = x -11
So, 7 years ago:
my brother was (x - 7)
and I was (x - 11 - 7)
Lets set an equation:
1/2 x I = B
This gives us 1/2 (x - 18) = x - 7
x - 18 = 2x - 14
x = -4
Why do I get a negative age? Can anyone help solve this one please?
You have that your age now is (x − 18),Natasha1 said:Homework Statement
Today i am half as old as my brother was 7 years ago. I am 11 years younger than my brother. How old am i?
2. The attempt at a solution
Let I = Me and B = Brother
Let: Brother age = x
Hence my age now = x -11
So, 7 years ago:
my brother was (x - 7)
and I was (x - 11 - 7)
Lets set an equation:
1/2 x I = B
This gives us 1/2 (x - 18) = x - 7
x - 18 = 2x - 14
x = -4
Why do I get a negative age? Can anyone help solve this one please?
Isn't his age now x-11? Isn't that half of what his brother was 7 years ago (x-7)?SammyS said:You have that your age now is (x − 18), which is right.
That is (equal to)1/2 of what your brother's age was 7 years ago: (x − 7)
Which thing should you take 1/2 of ?
Today i am half as old as my brother was 7 years ago. I am 11 years younger than my brother. How old am i?
The equation used to discover age is: Age = Current Year - Birth Year.
No, this equation is not accurate for everyone. It assumes that the person being tested was born in the same year as the current year, and does not take into account factors such as leap years or time zones.
Yes, this equation can be used for individuals born before the current year. As long as the current year and birth year are known, the equation can be used to calculate age.
Yes, there are other factors that should be considered when using this equation. It is important to make sure that the current year and birth year are accurate, and that the equation is adjusted for any potential discrepancies, such as leap years or time zones.
Yes, this equation can be used to accurately determine someone's age under the right circumstances. It is a simple and commonly used method, but may not be entirely accurate for everyone. Other methods, such as using official documents or asking the person directly, may also be necessary for accurate age determination.