# NCERT Class 8 Mathematics Solutions: Chapter 2 –Linear Equations in One Variable Exercise 2.4 Part 3

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**Question: 8** Half of a herd of deer are grazing in the field and three fourths of the remaining are playing nearby. The rest 9 are drinking water from the pond. Find the number of deer in the herd.

**Answer:**

Let the total number of deer in the herd be.

According to question,

Hence, the total number of deer in the herd is 72.

**Question: 9** A grandfathers is ten times older than his granddaughter. He is also 54 years older than her. Find their present ages.

**Answer:**

Let present age of granddaughter be years.

Therefore, Grandfather’s age = years.

According to question,

Years

Hence, granddaughter’s age = 6 years and

Grandfather’s age years

**Question: 10** A man’s age is three times his son’s age. Ten years ago he was five times his son’s age. Find their present ages.

**Answer:**

Let the present age of a man’s son be year.

Therefore, A man’s age = 3x years

According to question,

Hence, a man’s son age years

A man’s age =