Question

Сестре ? лет, а брату в три раза больше. всего им 16 лет. сколько лет брату?

Answer 1

Сестре х лет, тогда брату 3х лет. Составим уравнение:

х+3х=16

4х=16

х=16/4

х=4 года сестре

4*3=12 лет брату

Ответ: 12 лет

Answer 2

Сестре х лет

брату y

Система уравнений:

3x=y

x+y=16 ⇒ 4x=16 ⇒ x=4

у=12 лет брату

Answer 3

Let's solve this step by step:

Let's assume the sister's age is "x" years.

According to the information given, the brother's age is three times the sister's age, so the brother's age would be 3x years.

The sum of their ages is given as 16 years:

x (sister's age) + 3x (brother's age) = 16

Now, we can combine the sister's and brother's ages:

4x = 16

To find the value of "x" (sister's age), we can divide both sides by 4:

x = 16 / 4

x = 4

Now that we know the sister's age is 4 years, we can find the brother's age by multiplying it by 3:

Brother's age = 3 * 4 = 12 years

So, the brother is 12 years old.