$\dfrac{48}{72}$ in simplest form is

1. $\dfrac{8}{9}$

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

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

4. none of these

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

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

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

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

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

$\dfrac{117}{143}$ in simplest form is

1. $\dfrac{117}{143}$

2. $\dfrac{9}{11}$

3. $\dfrac{13}{11}$

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

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

1. 12

2. 15

3. 18

4. 16