$$\begin{aligned} \frac{4+4 \times 18 -6 - 8}{123 \times 6 - 146 \times 5 } \end{aligned}$$

Answer: Option A

Explanation:

$$\begin{aligned} => \frac{4}{7}x + \frac{4}{7} = \frac{15}{4} \end{aligned}$$
$$\begin{aligned} = \frac{4}{7}x = \frac{15}{4} - \frac{4}{7} \end{aligned}$$
$$\begin{aligned} = \frac{4}{7}x = \frac{7}{14} \end{aligned}$$
$$\begin{aligned} = x = \frac{1}{2}\times \frac{7}{4} = \frac{7}{8} \end{aligned}$$

Answer: Option B

Explanation:

$$\begin{aligned} \frac{4+72-6-8}{738-730} \end{aligned}$$
$$\begin{aligned} = \frac{76-14}{8} \end{aligned}$$
$$\begin{aligned} = \frac{62}{8} = 7.75 \end{aligned}$$

Answer: Option C

Explanation:

$$\begin{aligned} \frac{\frac{7}{2}\div {\frac{5}{2}} \times {\frac{3}{2}} }{\frac{7}{2} \div { \frac{5}{2}} of \frac{3}{2} }\div 5.25 \end{aligned}$$

$$\begin{aligned} = \frac{\frac{7}{2}\times {\frac{2}{5}} \times {\frac{3}{2}} }{\frac{7}{2} \div { \frac{15}{4}}}\div 5.25 \end{aligned}$$

$$\begin{aligned} = \frac{\frac{21}{10}} {\frac{7}{2} \times { \frac{4}{15}}}\div {\frac{525}{100}} \end{aligned}$$

$$\begin{aligned} = \frac{21}{10}\times{\frac{15}{14}}\times\frac{100}{525} = \frac{6}{14} = \frac{3}{7} \end{aligned}$$

Answer: Option B

Explanation:

= (31/10) * (3/10) + (7/5) / 20
= (3.1) * (.3) + (1.4) / 20
= 0.93 + 0.07
= 1

Answer: Option B

Explanation:

$$\begin{aligned} = 16-[5-(6+2(7-8+5))] \end{aligned}$$
(Please check due to overline, sign has been changed)
$$\begin{aligned} = 16-[5-(6+2 \times 4))] \end{aligned}$$
$$\begin{aligned} = 16-[-9] = 16 + 9 = 25 \end{aligned}$$