Ncert solutions

Ncert solutions

Grade 8

Direct and Inverse Proportions | Exercise 13.2

Question 11

Q11)  A school has 8 periods a day each of 45 minutes duration. How long would each period be? The school has 9 periods a day, assuming the number of school hours to be the same?

Solution:

Let the duration of each period be x.

Here the number of periods and the duration of periods are in inverse proportion.

\therefore\frac{8}{9}=\frac{x}{45}\Rightarrow x=\frac{8\times45}{9}

\Rightarrow\ x=40 minutes.

The duration of each period would be 40 minutes.

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subject-cta

Question 11

Q11)  A school has 8 periods a day each of 45 minutes duration. How long would each period be? The school has 9 periods a day, assuming the number of school hours to be the same?

Solution:

Let the duration of each period be x.

Here the number of periods and the duration of periods are in inverse proportion.

\therefore\frac{8}{9}=\frac{x}{45}\Rightarrow x=\frac{8\times45}{9}

\Rightarrow\ x=40 minutes.

The duration of each period would be 40 minutes.

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
subject-cta
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