Find answers to the following. Write and indicate how you solved them.

(a) 

Consider,

$\frac{5\times 5}{9\times 5}=\frac{25}{45} and \frac{4\times 9}{5\times 9}=\frac{36}{45}$

Here,

25 is not equal to 36

Therefore,

$\frac{5}{9} is not equal to \frac{4}{5}$

(b)

Consider,

$\frac{9\times 9}{16\times 9}=\frac{81}{144} and \frac{5\times 16}{9\times 16}=\frac{80}{144}$

Here,

81 is not equal to 80

Therefore,

$\frac{9}{16} is not equal to \frac{5}{9}$

(c) 

We know that ,

$\frac{16}{20}=\frac{4}{5}$

Therefore,

$\frac{4}{5}=\frac{16}{20}$

(d)

Here,

$\frac{4}{30}=\frac{2}{15}$

Therefore,

$\frac{1}{15} is not equal to \frac{4}{30}$