NCERT Class 7 Mathematics Solutions: Chapter 4 –Simple Equations Exercise 4.4 Part 3

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Understanding of simple equation

Example of Simple Equation

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1. Solve the following:

(i) Irfan says that he has marbles more than five times the marbles Parmit has. Irfan has marbles. How many marbles does Parmit have?

(ii) Laxmi’s father is years old. He is years older than three times Laxmi’s age. What is Laxmi’s age?

(iii) People of Sundergram planted a total of trees in the village garden. Some of the trees were fruit trees. The number of non-fruit trees were two more than three times the number of fruit trees. What was the number of fruit trees planted?

Answer:

(i) Consider the number of marbles Parmit has be .

According to the equation

So, Parmit has marbles.

(ii) Consider the age of Laxmi be years.

Then her father’s age years

According to question

So, the age of Laxmi is years.

(iii) Consider the number of fruit trees be .

Then the number of non-fruits tree

According to the question,

So, the number of fruit trees are .

2. Solve the following riddle:

I am a number,

Tell my identity!

Talk me seven times over,

And add a fifty!

To reach a triple century,

You still need forty!

Answer:

Consider the number be .

According to the question,

So, the required number is .