Question

В 2015 году возраст Билла равен сумме цифр года его рождения. Его тетя старше и в 2015 году ее возраст тоже равен сумме цифр года ее рождения. На сколько лет Билл младше своей тети?

Answer 1

1) 
Пускай Билл родился в 20ху году.
2015-(2000+10х+у)=2+0+х+у
15-10х-у=2+х+у
11х+2у=13
х=1,  у=1
 Значит, Билл родился в 2011 году и ему сейчас 4 года.

2)
Пускай тетя родилась в 19ас году

2015-(1900+10а+с)=1+9+а+с
115-10а-с=10+а+с
11а+2с=105
а=9,  с=3 
Значит, тетя родилась в 1993 году и ей сейчас 22 года.

Отсюда следует, что Билл моложе на: 22-4=18 лет.

 

Answer 2

Calculation of Bill's Age and His Aunt's Age

To determine the age difference between Bill and his aunt, we need to find the values of their ages in 2015 and the sum of the digits of their respective birth years.

Let's assume Bill's birth year is represented by the digits AB, and his aunt's birth year is represented by the digits CD.

According to the given information, in 2015, the sum of the digits of Bill's birth year (AB) is equal to his age, and the sum of the digits of his aunt's birth year (CD) is equal to her age.

Therefore, we can write the following equations:

1. A + B = Bill's age in 2015 2. C + D = Aunt's age in 2015

We also know that Bill's age is equal to the sum of the digits of his birth year, and his aunt's age is equal to the sum of the digits of her birth year.

Let's solve these equations to find the values of A, B, C, and D.

Solution:

Since we don't have the specific values of A, B, C, and D, we cannot provide an exact answer to the question. However, we can explain the process of finding the age difference between Bill and his aunt.

To find the age difference, we need to subtract Bill's age from his aunt's age:

Age difference = Aunt's age - Bill's age

Once we have the values of A, B, C, and D, we can substitute them into the equations and calculate the ages of Bill and his aunt in 2015. Then, we can find the age difference.

Please provide the specific values of A, B, C, and D, and we will be able to calculate the age difference for you.