Question

The sum of ages of brother and sister is 70 years, and the ratio of their age is 3:2. How old is the sister?

A. 20 years
B. 30 years
C. 40 years
D. 50 years

Answer 1

The sister's age is 28 years old.

Step-by-step explanation:

To find the age of the sister, we can set up the equations:

Let the brother's age be 3x

Let the sister's age be 2x

According to the given information, the sum of their ages is 70:

3x + 2x = 70

5x = 70

x = 14

So, the sister's age is 2x = 2 * 14 = 28 years old. Therefore, the sister is 28 years old.