$\dfrac{42}{54}$ in simplest form is

1. $\dfrac{3}{4}$

2. $\dfrac{2}{3}$

3. $\dfrac{3}{7}$

4. $\dfrac{7}{9}$

$\dfrac{91}{114}$ in simplest form is

1. $\dfrac{13}{8}$

2. $\dfrac{7}{8}$

3. $\dfrac{91}{114}$

4. $\dfrac{9}{13}$

If $\dfrac{3}{4}$ is equivalent to $\dfrac{x}{20}$, then x = ?

1. 12

2. 15

3. 18

4. 16

If $\dfrac{3}{x}$ is equivalent to $\dfrac{45}{60}$, then the value of x is

1. 4

2. 5

3. 6

4. 20