Ncert solutions

Ncert solutions

Grade 8

Linear Equations in One Variable | Exercise 2.2

Question 12

Q12) Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present age?

Solution:

Let Ravi’s present age be x years.

After fifteen years, Ravi’s age = 4x years.

Fifteen years from now, Ravi’s age = (x+15) years.

According to question, 4x = x + 15

\Rightarrow\ 4x-x=15

[Transposing x to L.H.S]

3x = 15

\Rightarrow\ \frac{3x}{3}=\frac{15}{3}

[Dividing both sides by 3]

x = 5 years.

Hence, Ravi’s present age be 5 years.

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subject-cta

Question 12

Q12) Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present age?

Solution:

Let Ravi’s present age be x years.

After fifteen years, Ravi’s age = 4x years.

Fifteen years from now, Ravi’s age = (x+15) years.

According to question, 4x = x + 15

\Rightarrow\ 4x-x=15

[Transposing x to L.H.S]

3x = 15

\Rightarrow\ \frac{3x}{3}=\frac{15}{3}

[Dividing both sides by 3]

x = 5 years.

Hence, Ravi’s present age be 5 years.

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your mathematics exam ?

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Book a free class now
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