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Introduction to Ratio

Question 1 On...

Question

Question 1

Only one of the four options is correct. Write the correct one.

The ratio of 8 books to 20 books is

a) 2 : 5

b) 5 : 2

c) 4 : 5

d) 5 : 4

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Solution

Ratio of 8 books to 20 books = $\frac{8 b o o k s}{20 b o o k s}$
$= \frac{8}{20} = \frac{2}{5}$ [on dividing numerator and denominator by 4]
= 2 : 5
Hence, (a) is the correct option.

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Question 6

In the following question, out of the four options, only one is correct. Write the correct answer:

The value of ${(\frac{2}{5})}^{- 2}$ is
(a) $\frac{4}{5}$
(b) $\frac{4}{25}$
(c) $\frac{25}{4}$
(d) $\frac{5}{2}$

Question 7

In the following question, out of the four options, only one is correct. Write the correct answer:

The reciprocal of ${(\frac{2}{5})}^{- 1}$ is:
(a) $\frac{2}{5}$

(b) $\frac{5}{2}$

(c) $- \frac{5}{2}$

(d) $- \frac{2}{5}$

Question 7

Only one of the four options is correct. Write the correct one.

On a shelf, books with green cover and that with brown cover are in the ratio 2 : 3. If there are 18 books with green cover, then the number of books with brown cover is

a) 12

b) 24

c) 27

d) 36

Question 6

In the following question, out of the four options, only one is correct. Write the correct answer:

The value of ${(\frac{2}{5})}^{- 2}$ is
(a) $\frac{4}{5}$
(b) $\frac{4}{25}$
(c) $\frac{25}{4}$
(d) $\frac{5}{2}$

Question 2

Only one of the four options is correct. Write the correct one.

The ratio of the number of sides of a square to the number of edges of a cube is

a) 1 : 2

b) 3 : 2

c) 4 : 1

d) 1 : 3

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Introduction to Ratio

Standard VII Mathematics

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