A girl was born 25 years after her mother. What fraction of her mother's age will the girl be at the age of 10

10/35 = 2/7

You will subtract 15 from 35

To determine the fraction of her mother's age the girl will be at the age of 10, we need to calculate the ratio between their ages at that time.

Let's break down the information given:
- The girl was born 25 years after her mother.
- To find the girl's age at the specific time (10 years old), we need to consider that the girl was born 25 years after her mother.
- So, if the girl is 10 years old, her mother will be 10 + 25 = 35 years old at that time.

Now, let's find the fraction of her mother's age that the girl will be:
- The girl will be 10 years old, while her mother will be 35 years old.
- To find the fraction, divide the girl's age by her mother's age: 10 / 35 = 2/7.

Therefore, the girl will be 2/7 of her mother's age at the age of 10.